21125515332 has 48 divisors (see below), whose sum is σ = 51904798400. Its totient is φ = 6668956800.

The previous prime is 21125515321. The next prime is 21125515343. The reversal of 21125515332 is 23351552112.

It is an interprime number because it is at equal distance from previous prime (21125515321) and next prime (21125515343).

It is a self number, because there is not a number n which added to its sum of digits gives 21125515332.

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, 738594 + ... + 766662.

Almost surely, 2^21125515332 is an apocalyptic number.

It is an amenable number.

21125515332 is an abundant number, since it is smaller than the sum of its proper divisors (30779283068).

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

21125515332 is a wasteful number, since it uses less digits than its factorization.

21125515332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31396 (or 31394 counting only the distinct ones).

The product of its digits is 9000, while the sum is 30.

The spelling of 21125515332 in words is "twenty-one billion, one hundred twenty-five million, five hundred fifteen thousand, three hundred thirty-two".