21713255406 has 48 divisors (see below), whose sum is σ = 49844521584. Its totient is φ = 6807658752.

The previous prime is 21713255393. The next prime is 21713255411. The reversal of 21713255406 is 60455231712.

21713255406 is a `hidden beast` number, since 2 + 1 + 71 + 32 + 554 + 0 + 6 = 666.

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, 476056 + ... + 519668.

It is an arithmetic number, because the mean of its divisors is an integer number (1038427533).

Almost surely, 2^21713255406 is an apocalyptic number.

21713255406 is an abundant number, since it is smaller than the sum of its proper divisors (28131266178).

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

21713255406 is a wasteful number, since it uses less digits than its factorization.

21713255406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45265 (or 45262 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The spelling of 21713255406 in words is "twenty-one billion, seven hundred thirteen million, two hundred fifty-five thousand, four hundred six".