21622566752 has 48 divisors (see below), whose sum is σ = 43753414320. Its totient is φ = 10511036928.

The previous prime is 21622566739. The next prime is 21622566787. The reversal of 21622566752 is 25766522612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1721198 + ... + 1733714.

It is an arithmetic number, because the mean of its divisors is an integer number (911529465).

Almost surely, 2^21622566752 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21622566752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21876707160).

21622566752 is an abundant number, since it is smaller than the sum of its proper divisors (22130847568).

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

21622566752 is a wasteful number, since it uses less digits than its factorization.

21622566752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14023 (or 14015 counting only the distinct ones).

The product of its digits is 604800, while the sum is 44.

The spelling of 21622566752 in words is "twenty-one billion, six hundred twenty-two million, five hundred sixty-six thousand, seven hundred fifty-two".