21312495282 has 64 divisors (see below), whose sum is σ = 49625896320. Its totient is φ = 6044626944.

The previous prime is 21312495251. The next prime is 21312495389. The reversal of 21312495282 is 28259421312.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 21312495282.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 139503 + ... + 249170.

It is an arithmetic number, because the mean of its divisors is an integer number (775404630).

Almost surely, 2^21312495282 is an apocalyptic number.

21312495282 is an abundant number, since it is smaller than the sum of its proper divisors (28313401038).

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

21312495282 is a wasteful number, since it uses less digits than its factorization.

21312495282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388747.

The product of its digits is 69120, while the sum is 39.

The spelling of 21312495282 in words is "twenty-one billion, three hundred twelve million, four hundred ninety-five thousand, two hundred eighty-two".