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21361641 = 372347941
BaseRepresentation
bin101000101111…
…1001111101001
31111012021122220
41101133033221
520432033031
62041504253
7346366560
oct121371751
944167586
1021361641
1111070354
1271a2089
13456c132
142ba0bd7
151d1e596
hex145f3e9

21361641 has 32 divisors (see below), whose sum is σ = 34725888. Its totient is φ = 11415360.

The previous prime is 21361619. The next prime is 21361709. The reversal of 21361641 is 14616312.

It is not a de Polignac number, because 21361641 - 25 = 21361609 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21360641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22231 + ... + 23171.

It is an arithmetic number, because the mean of its divisors is an integer number (1085184).

Almost surely, 221361641 is an apocalyptic number.

21361641 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21361641 is a deficient number, since it is larger than the sum of its proper divisors (13364247).

21361641 is a wasteful number, since it uses less digits than its factorization.

21361641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021.

The product of its digits is 864, while the sum is 24.

The square root of 21361641 is about 4621.8655324447. The cubic root of 21361641 is about 277.4671270207.

Adding to 21361641 its reverse (14616312), we get a palindrome (35977953).

The spelling of 21361641 in words is "twenty-one million, three hundred sixty-one thousand, six hundred forty-one".

Divisors: 1 3 7 21 23 47 69 141 161 329 483 941 987 1081 2823 3243 6587 7567 19761 21643 22701 44227 64929 132681 151501 309589 454503 928767 1017221 3051663 7120547 21361641