21471403256568 has 48 divisors (see below), whose sum is σ = 58151984883720. Its totient is φ = 7157101467456.

The previous prime is 21471403256557. The next prime is 21471403256587. The reversal of 21471403256568 is 86565230417412.

21471403256568 is a `hidden beast` number, since 2 + 1 + 4 + 7 + 1 + 40 + 32 + 5 + 6 + 568 = 666.

It is a super-2 number, since 2×21471403256568² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18924255 + ... + 20026737.

Almost surely, 2^{21471403256568} is an apocalyptic number.

It is an amenable number.

21471403256568 is an abundant number, since it is smaller than the sum of its proper divisors (36680581627152).

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

21471403256568 is a wasteful number, since it uses less digits than its factorization.

21471403256568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372988 (or 1372981 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 54.

The spelling of 21471403256568 in words is "twenty-one trillion, four hundred seventy-one billion, four hundred three million, two hundred fifty-six thousand, five hundred sixty-eight".