21644046022 has 16 divisors (see below), whose sum is σ = 32674440960. Its totient is φ = 10752621448.

The previous prime is 21644045989. The next prime is 21644046059. The reversal of 21644046022 is 22064044612.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 848823 + ... + 873949.

It is an arithmetic number, because the mean of its divisors is an integer number (2042152560).

Almost surely, 2^21644046022 is an apocalyptic number.

21644046022 is a deficient number, since it is larger than the sum of its proper divisors (11030394938).

21644046022 is a wasteful number, since it uses less digits than its factorization.

21644046022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27875.

The product of its (nonzero) digits is 18432, while the sum is 31.

The spelling of 21644046022 in words is "twenty-one billion, six hundred forty-four million, forty-six thousand, twenty-two".