21512311292 has 12 divisors (see below), whose sum is σ = 39861047520. Its totient is φ = 10123440576.

The previous prime is 21512311237. The next prime is 21512311319. The reversal of 21512311292 is 29211321512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158178692 + ... + 158178827.

It is an arithmetic number, because the mean of its divisors is an integer number (3321753960).

Almost surely, 2^21512311292 is an apocalyptic number.

It is an amenable number.

21512311292 is a deficient number, since it is larger than the sum of its proper divisors (18348736228).

21512311292 is a wasteful number, since it uses less digits than its factorization.

21512311292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316357540 (or 316357538 counting only the distinct ones).

The product of its digits is 2160, while the sum is 29.

The spelling of 21512311292 in words is "twenty-one billion, five hundred twelve million, three hundred eleven thousand, two hundred ninety-two".