21185061056 has 14 divisors (see below), whose sum is σ = 42039105660. Its totient is φ = 10592530496.

The previous prime is 21185061043. The next prime is 21185061067. The reversal of 21185061056 is 65016058112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165508226 + ... + 165508353.

Almost surely, 2^21185061056 is an apocalyptic number.

It is an amenable number.

21185061056 is a deficient number, since it is larger than the sum of its proper divisors (20854044604).

21185061056 is an equidigital number, since it uses as much as digits as its factorization.

21185061056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331016591 (or 331016581 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 35.

The spelling of 21185061056 in words is "twenty-one billion, one hundred eighty-five million, sixty-one thousand, fifty-six".