21638797038892 has 96 divisors (see below), whose sum is σ = 42819805163520. Its totient is φ = 9479153952000.

The previous prime is 21638797038797. The next prime is 21638797038941. The reversal of 21638797038892 is 29883079783612.

It is a super-2 number, since 2×21638797038892² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323915238 + ... + 323982034.

It is an arithmetic number, because the mean of its divisors is an integer number (446039637120).

Almost surely, 2^{21638797038892} is an apocalyptic number.

21638797038892 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21638797038892 is a deficient number, since it is larger than the sum of its proper divisors (21181008124628).

21638797038892 is a wasteful number, since it uses less digits than its factorization.

21638797038892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67823 (or 67821 counting only the distinct ones).

The product of its (nonzero) digits is 438939648, while the sum is 73.

It can be divided in two parts, 216387 and 97038892, that added together give a palindrome (97255279).

The spelling of 21638797038892 in words is "twenty-one trillion, six hundred thirty-eight billion, seven hundred ninety-seven million, thirty-eight thousand, eight hundred ninety-two".