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213443123661621 = 32746777319014937
BaseRepresentation
bin110000100010000000011001…
…100100001100101100110101
31000222201222000021110221112100
4300202000121210030230311
5210434023004124132441
62033542230052012313
762646520403135220
oct6042003144145465
91028658007427470
10213443123661621
11620117a1946707
121bb3285a301099
1392137a5828b69
143a9c9b91b25b7
1519a222ae75cb6
hexc2201990cb35

213443123661621 has 96 divisors (see below), whose sum is σ = 353819489257728. Its totient is φ = 121460333644800.

The previous prime is 213443123661619. The next prime is 213443123661689. The reversal of 213443123661621 is 126166321344312.

213443123661621 is a `hidden beast` number, since 2 + 1 + 3 + 4 + 4 + 3 + 1 + 2 + 3 + 6 + 616 + 21 = 666.

It is not a de Polignac number, because 213443123661621 - 21 = 213443123661619 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213443123661121) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 43233362665 + ... + 43233367601.

It is an arithmetic number, because the mean of its divisors is an integer number (3685619679768).

Almost surely, 2213443123661621 is an apocalyptic number.

213443123661621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

213443123661621 is a deficient number, since it is larger than the sum of its proper divisors (140376365596107).

213443123661621 is a wasteful number, since it uses less digits than its factorization.

213443123661621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8091 (or 8088 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The spelling of 213443123661621 in words is "two hundred thirteen trillion, four hundred forty-three billion, one hundred twenty-three million, six hundred sixty-one thousand, six hundred twenty-one".

Divisors: 1 3 7 9 21 63 467 773 1401 1901 2319 3269 4203 4937 5411 5703 6957 9807 13307 14811 16233 17109 29421 34559 39921 44433 48699 103677 119763 311031 360991 887767 1082973 1469473 2305579 2526937 2663301 3248919 3816301 4408419 6214369 6916737 7580811 7989903 9385237 10286311 11448903 13225257 16139053 18643107 20750211 22742433 26714107 28155711 30858933 34346709 48417159 55929321 65696659 80142321 84467133 92576799 145251477 197089977 240426963 591269931 686243891 1782212567 2058731673 4382905679 4803707237 5346637701 6176195019 7254788201 12475487969 13148717037 14411121711 16039913103 21764364603 30680339753 37426463907 39446151111 43233365133 50783517407 65293093809 92041019259 112279391721 152350552221 276123057777 457051656663 3387986089867 10163958269601 23715902629069 30491874808803 71147707887207 213443123661621