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21013121131 = 191241145631
BaseRepresentation
bin10011100100011110…
…101100100001101011
32000020102220011011121
4103210132230201223
5321013324334011
613353040040111
71342503403552
oct234436544153
960212804147
1021013121131
118a033a4a12
1240a5303037
131c9b55a1b2
141034a8ad99
1582eb8ee71
hex4e47ac86b

21013121131 has 8 divisors (see below), whose sum is σ = 21132361728. Its totient is φ = 20893977000.

The previous prime is 21013121123. The next prime is 21013121153. The reversal of 21013121131 is 13112131012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21013121131 - 23 = 21013121123 is a prime.

It is a super-2 number, since 2×210131211312 (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21013121161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437686 + ... + 483316.

It is an arithmetic number, because the mean of its divisors is an integer number (2641545216).

Almost surely, 221013121131 is an apocalyptic number.

21013121131 is a deficient number, since it is larger than the sum of its proper divisors (119240597).

21013121131 is a wasteful number, since it uses less digits than its factorization.

21013121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48233.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21013121131 its reverse (13112131012), we get a palindrome (34125252143).

The spelling of 21013121131 in words is "twenty-one billion, thirteen million, one hundred twenty-one thousand, one hundred thirty-one".

Divisors: 1 191 2411 45631 460501 8715521 110016341 21013121131