21656982060 has 72 divisors (see below), whose sum is σ = 75077542176. Its totient is φ = 4950167040.

The previous prime is 21656982001. The next prime is 21656982079. The reversal of 21656982060 is 6028965612.

21656982060 is a `hidden beast` number, since 2 + 1 + 6 + 569 + 8 + 20 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 21656981997 and 21656982015.

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, 8592781 + ... + 8595300.

Almost surely, 2^21656982060 is an apocalyptic number.

21656982060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21656982060 is an abundant number, since it is smaller than the sum of its proper divisors (53420560116).

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

21656982060 is a wasteful number, since it uses less digits than its factorization.

21656982060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17188103 (or 17188098 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 21656982060 in words is "twenty-one billion, six hundred fifty-six million, nine hundred eighty-two thousand, sixty".