23121510012 has 72 divisors (see below), whose sum is σ = 62635556256. Its totient is φ = 7172820864.

The previous prime is 23121509977. The next prime is 23121510019. The reversal of 23121510012 is 21001512132.

23121510012 is a `hidden beast` number, since 23 + 121 + 510 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121510019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 346723 + ... + 407994.

Almost surely, 2^23121510012 is an apocalyptic number.

It is an amenable number.

23121510012 is an abundant number, since it is smaller than the sum of its proper divisors (39514046244).

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

23121510012 is a wasteful number, since it uses less digits than its factorization.

23121510012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754787 (or 754782 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The spelling of 23121510012 in words is "twenty-three billion, one hundred twenty-one million, five hundred ten thousand, twelve".