21089946630 has 32 divisors (see below), whose sum is σ = 51445644768. Its totient is φ = 5531788800.

The previous prime is 21089946607. The next prime is 21089946727. The reversal of 21089946630 is 3664998012.

It is a self number, because there is not a number n which added to its sum of digits gives 21089946630.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5760451 + ... + 5764110.

It is an arithmetic number, because the mean of its divisors is an integer number (1607676399).

Almost surely, 2^21089946630 is an apocalyptic number.

21089946630 is an abundant number, since it is smaller than the sum of its proper divisors (30355698138).

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

21089946630 is a wasteful number, since it uses less digits than its factorization.

21089946630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11524632.

The product of its (nonzero) digits is 559872, while the sum is 48.

The spelling of 21089946630 in words is "twenty-one billion, eighty-nine million, nine hundred forty-six thousand, six hundred thirty".