21807226655 has 8 divisors (see below), whose sum is σ = 26184417792. Its totient is φ = 17435284128.

The previous prime is 21807226603. The next prime is 21807226673. The reversal of 21807226655 is 55662270812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21807226655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1303004 + ... + 1319633.

It is an arithmetic number, because the mean of its divisors is an integer number (3273052224).

Almost surely, 2^21807226655 is an apocalyptic number.

21807226655 is a deficient number, since it is larger than the sum of its proper divisors (4377191137).

21807226655 is a wasteful number, since it uses less digits than its factorization.

21807226655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2624305.

The product of its (nonzero) digits is 403200, while the sum is 44.

The spelling of 21807226655 in words is "twenty-one billion, eight hundred seven million, two hundred twenty-six thousand, six hundred fifty-five".