21099510622 has 32 divisors (see below), whose sum is σ = 32565141504. Its totient is φ = 10248919200.

The previous prime is 21099510613. The next prime is 21099510631. The reversal of 21099510622 is 22601599012.

It is an interprime number because it is at equal distance from previous prime (21099510613) and next prime (21099510631).

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, 4593547 + ... + 4598137.

It is an arithmetic number, because the mean of its divisors is an integer number (1017660672).

Almost surely, 2^21099510622 is an apocalyptic number.

21099510622 is a deficient number, since it is larger than the sum of its proper divisors (11465630882).

21099510622 is a wasteful number, since it uses less digits than its factorization.

21099510622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5064.

The product of its (nonzero) digits is 19440, while the sum is 37.

The spelling of 21099510622 in words is "twenty-one billion, ninety-nine million, five hundred ten thousand, six hundred twenty-two".