23121531511320 has 64 divisors (see below), whose sum is σ = 75670466768640. Its totient is φ = 5605219760000.

The previous prime is 23121531511303. The next prime is 23121531511367. The reversal of 23121531511320 is 2311513512132.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 8758154556 + ... + 8758157195.

It is an arithmetic number, because the mean of its divisors is an integer number (1182351043260).

Almost surely, 2^{23121531511320} is an apocalyptic number.

23121531511320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23121531511320 is an abundant number, since it is smaller than the sum of its proper divisors (52548935257320).

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

23121531511320 is a wasteful number, since it uses less digits than its factorization.

23121531511320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17516311776 (or 17516311772 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The spelling of 23121531511320 in words is "twenty-three trillion, one hundred twenty-one billion, five hundred thirty-one million, five hundred eleven thousand, three hundred twenty".