21242515320 has 96 divisors (see below), whose sum is σ = 74348820000. Its totient is φ = 5228925696.

The previous prime is 21242515309. The next prime is 21242515331. The reversal of 21242515320 is 2351524212.

21242515320 is a `hidden beast` number, since 2 + 124 + 2 + 5 + 1 + 532 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (21242515309) and next prime (21242515331).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2264820 + ... + 2274179.

It is an arithmetic number, because the mean of its divisors is an integer number (774466875).

Almost surely, 2^21242515320 is an apocalyptic number.

21242515320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21242515320 is an abundant number, since it is smaller than the sum of its proper divisors (53106304680).

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

21242515320 is a wasteful number, since it uses less digits than its factorization.

21242515320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4539029 (or 4539022 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21242515320 in words is "twenty-one billion, two hundred forty-two million, five hundred fifteen thousand, three hundred twenty".