21638883612 has 48 divisors (see below), whose sum is σ = 51148500480. Its totient is φ = 7119499968.

The previous prime is 21638883611. The next prime is 21638883649.

21638883612 is nontrivially palindromic in base 10.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21638883611) 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, 312553 + ... + 375455.

It is an arithmetic number, because the mean of its divisors is an integer number (1065593760).

Almost surely, 2^21638883612 is an apocalyptic number.

It is an amenable number.

21638883612 is an abundant number, since it is smaller than the sum of its proper divisors (29509616868).

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

21638883612 is a wasteful number, since it uses less digits than its factorization.

21638883612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63282 (or 63280 counting only the distinct ones).

The product of its digits is 663552, while the sum is 48.

The spelling of 21638883612 in words is "twenty-one billion, six hundred thirty-eight million, eight hundred eighty-three thousand, six hundred twelve".