21632275644 has 48 divisors (see below), whose sum is σ = 57852388608. Its totient is φ = 6162830208.

The previous prime is 21632275619. The next prime is 21632275649. The reversal of 21632275644 is 44657223612.

It is a super-2 number, since 2×21632275644² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 21632275596 and 21632275605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21632275649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 341929 + ... + 400224.

It is an arithmetic number, because the mean of its divisors is an integer number (1205258096).

Almost surely, 2^21632275644 is an apocalyptic number.

It is an amenable number.

21632275644 is an abundant number, since it is smaller than the sum of its proper divisors (36220112964).

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

21632275644 is a wasteful number, since it uses less digits than its factorization.

21632275644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742514 (or 742512 counting only the distinct ones).

The product of its digits is 483840, while the sum is 42.

The spelling of 21632275644 in words is "twenty-one billion, six hundred thirty-two million, two hundred seventy-five thousand, six hundred forty-four".