21955602 has 32 divisors (see below), whose sum is σ = 48945600. Its totient is φ = 6524928.

The previous prime is 21955589. The next prime is 21955613. The reversal of 21955602 is 20655912.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21955602.

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, 3727 + ... + 7602.

It is an arithmetic number, because the mean of its divisors is an integer number (1529550).

Almost surely, 2^21955602 is an apocalyptic number.

21955602 is an abundant number, since it is smaller than the sum of its proper divisors (26989998).

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

21955602 is a wasteful number, since it uses less digits than its factorization.

21955602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11370.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 21955602 is about 4685.6805268819. The cubic root of 21955602 is about 280.0153137883.

The spelling of 21955602 in words is "twenty-one million, nine hundred fifty-five thousand, six hundred two".