21570586128 has 120 divisors (see below), whose sum is σ = 74298730688. Its totient is φ = 5688942336.

The previous prime is 21570586109. The next prime is 21570586139. The reversal of 21570586128 is 82168507512.

21570586128 is a `hidden beast` number, since 2 + 1 + 57 + 0 + 586 + 12 + 8 = 666.

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, 809950 + ... + 836157.

Almost surely, 2^21570586128 is an apocalyptic number.

21570586128 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21570586128 is an abundant number, since it is smaller than the sum of its proper divisors (52728144560).

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

21570586128 is a wasteful number, since it uses less digits than its factorization.

21570586128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1646141 (or 1646132 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 21570586128 in words is "twenty-one billion, five hundred seventy million, five hundred eighty-six thousand, one hundred twenty-eight".