21654502002 has 48 divisors (see below), whose sum is σ = 54030030912. Its totient is φ = 6139766880.

The previous prime is 21654501983. The next prime is 21654502019. The reversal of 21654502002 is 20020545612.

21654502002 is a `hidden beast` number, since 2 + 1 + 6 + 5 + 450 + 200 + 2 = 666.

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, 639453 + ... + 672464.

It is an arithmetic number, because the mean of its divisors is an integer number (1125625644).

Almost surely, 2^21654502002 is an apocalyptic number.

21654502002 is an abundant number, since it is smaller than the sum of its proper divisors (32375528910).

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

21654502002 is a wasteful number, since it uses less digits than its factorization.

21654502002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1312063 (or 1312060 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The spelling of 21654502002 in words is "twenty-one billion, six hundred fifty-four million, five hundred two thousand, two".