21648862602 has 64 divisors (see below), whose sum is σ = 51024556800. Its totient is φ = 6780326400.

The previous prime is 21648862589. The next prime is 21648862639. The reversal of 21648862602 is 20626884612.

21648862602 is a `hidden beast` number, since 2 + 16 + 4 + 8 + 8 + 626 + 0 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 532099 + ... + 571337.

It is an arithmetic number, because the mean of its divisors is an integer number (797258700).

Almost surely, 2^21648862602 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21648862602, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25512278400).

21648862602 is an abundant number, since it is smaller than the sum of its proper divisors (29375694198).

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

21648862602 is a wasteful number, since it uses less digits than its factorization.

21648862602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39868 (or 39862 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 21648862602 in words is "twenty-one billion, six hundred forty-eight million, eight hundred sixty-two thousand, six hundred two".