21500303672556 has 24 divisors (see below), whose sum is σ = 55741528040240. Its totient is φ = 7166767890816.

The previous prime is 21500303672483. The next prime is 21500303672569. The reversal of 21500303672556 is 65527630300512.

21500303672556 is a `hidden beast` number, since 2 + 1 + 5 + 0 + 0 + 30 + 3 + 67 + 2 + 556 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99538442821 + ... + 99538443036.

Almost surely, 2^{21500303672556} is an apocalyptic number.

It is an amenable number.

21500303672556 is an abundant number, since it is smaller than the sum of its proper divisors (34241224367684).

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

21500303672556 is a wasteful number, since it uses less digits than its factorization.

21500303672556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199076885870 (or 199076885862 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 45.

The spelling of 21500303672556 in words is "twenty-one trillion, five hundred billion, three hundred three million, six hundred seventy-two thousand, five hundred fifty-six".