21150456056 has 64 divisors (see below), whose sum is σ = 41431910400. Its totient is φ = 10110672000.

The previous prime is 21150456017. The next prime is 21150456079. The reversal of 21150456056 is 65065405112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21515741 + ... + 21516723.

It is an arithmetic number, because the mean of its divisors is an integer number (647373600).

Almost surely, 2^21150456056 is an apocalyptic number.

It is an amenable number.

21150456056 is a deficient number, since it is larger than the sum of its proper divisors (20281454344).

21150456056 is a wasteful number, since it uses less digits than its factorization.

21150456056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980 (or 1976 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 35.

The spelling of 21150456056 in words is "twenty-one billion, one hundred fifty million, four hundred fifty-six thousand, fifty-six".