21637343379056 has 40 divisors (see below), whose sum is σ = 43585817193744. Its totient is φ = 10397267274240.

The previous prime is 21637343379023. The next prime is 21637343379059. The reversal of 21637343379056 is 65097334373612.

It is a super-2 number, since 2×21637343379056² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21637343378986 and 21637343379004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21637343379059) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246103475 + ... + 246191378.

Almost surely, 2^{21637343379056} is an apocalyptic number.

It is an amenable number.

21637343379056 is an abundant number, since it is smaller than the sum of its proper divisors (21948473814688).

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

21637343379056 is a wasteful number, since it uses less digits than its factorization.

21637343379056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492294969 (or 492294963 counting only the distinct ones).

The product of its (nonzero) digits is 51438240, while the sum is 59.

The spelling of 21637343379056 in words is "twenty-one trillion, six hundred thirty-seven billion, three hundred forty-three million, three hundred seventy-nine thousand, fifty-six".