21152510512 has 30 divisors (see below), whose sum is σ = 47674091148. Its totient is φ = 9065361312.

The previous prime is 21152510479. The next prime is 21152510539. The reversal of 21152510512 is 21501525112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13489338 + ... + 13490905.

Almost surely, 2^21152510512 is an apocalyptic number.

It is an amenable number.

21152510512 is an abundant number, since it is smaller than the sum of its proper divisors (26521580636).

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

21152510512 is a wasteful number, since it uses less digits than its factorization.

21152510512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26980265 (or 26980252 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 25.

The spelling of 21152510512 in words is "twenty-one billion, one hundred fifty-two million, five hundred ten thousand, five hundred twelve".