21110654808 has 80 divisors (see below), whose sum is σ = 62607611880. Its totient is φ = 6622947072.

The previous prime is 21110654797. The next prime is 21110654821. The reversal of 21110654808 is 80845601112.

21110654808 is a `hidden beast` number, since 2 + 1 + 1 + 106 + 548 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 947166 + ... + 969197.

Almost surely, 2^21110654808 is an apocalyptic number.

It is an amenable number.

21110654808 is an abundant number, since it is smaller than the sum of its proper divisors (41496957072).

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

21110654808 is a wasteful number, since it uses less digits than its factorization.

21110654808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916398 (or 1916385 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The spelling of 21110654808 in words is "twenty-one billion, one hundred ten million, six hundred fifty-four thousand, eight hundred eight".