21270556056 has 16 divisors (see below), whose sum is σ = 53176390200. Its totient is φ = 7090185344.

The previous prime is 21270556019. The next prime is 21270556061. The reversal of 21270556056 is 65065507212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 443136561 + ... + 443136608.

Almost surely, 2^21270556056 is an apocalyptic number.

It is an amenable number.

21270556056 is an abundant number, since it is smaller than the sum of its proper divisors (31905834144).

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

21270556056 is a wasteful number, since it uses less digits than its factorization.

21270556056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886273178 (or 886273174 counting only the distinct ones).

The product of its (nonzero) digits is 126000, while the sum is 39.

The spelling of 21270556056 in words is "twenty-one billion, two hundred seventy million, five hundred fifty-six thousand, fifty-six".