231621131028 has 72 divisors (see below), whose sum is σ = 638223692736. Its totient is φ = 64042686720.

The previous prime is 231621131003. The next prime is 231621131051. The reversal of 231621131028 is 820131126132.

It is a junction number, because it is equal to n+sod(n) for n = 231621130986 and 231621131004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1353925 + ... + 1515372.

Almost surely, 2^231621131028 is an apocalyptic number.

231621131028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

231621131028 is an abundant number, since it is smaller than the sum of its proper divisors (406602561708).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231621131028 is a wasteful number, since it uses less digits than its factorization.

231621131028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2869373 (or 2869340 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 231621131028 in words is "two hundred thirty-one billion, six hundred twenty-one million, one hundred thirty-one thousand, twenty-eight".