231021111120 has 80 divisors (see below), whose sum is σ = 716273506752. Its totient is φ = 61596334080.

The previous prime is 231021111107. The next prime is 231021111137. The reversal of 231021111120 is 21111120132.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 231021111120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1601499 + ... + 1739781.

Almost surely, 2^231021111120 is an apocalyptic number.

231021111120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231021111120 is an abundant number, since it is smaller than the sum of its proper divisors (485252395632).

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

231021111120 is a wasteful number, since it uses less digits than its factorization.

231021111120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145260 (or 145254 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 231021111120 its reverse (21111120132), we get a palindrome (252132231252).

The spelling of 231021111120 in words is "two hundred thirty-one billion, twenty-one million, one hundred eleven thousand, one hundred twenty".