21660355563622 has 32 divisors (see below), whose sum is σ = 35355501799200. Its totient is φ = 9912583070208.

The previous prime is 21660355563619. The next prime is 21660355563647. The reversal of 21660355563622 is 22636555306612.

It is a self number, because there is not a number n which added to its sum of digits gives 21660355563622.

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, 32013597 + ... + 32683192.

It is an arithmetic number, because the mean of its divisors is an integer number (1104859431225).

Almost surely, 2^{21660355563622} is an apocalyptic number.

21660355563622 is a deficient number, since it is larger than the sum of its proper divisors (13695146235578).

21660355563622 is a wasteful number, since it uses less digits than its factorization.

21660355563622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64697080.

The product of its (nonzero) digits is 11664000, while the sum is 52.

The spelling of 21660355563622 in words is "twenty-one trillion, six hundred sixty billion, three hundred fifty-five million, five hundred sixty-three thousand, six hundred twenty-two".