21705622559056 has 10 divisors (see below), whose sum is σ = 42054643708202. Its totient is φ = 10852811279520.

The previous prime is 21705622558993. The next prime is 21705622559059. The reversal of 21705622559056 is 65095522650712.

It can be written as a sum of positive squares in only one way, i.e., 13458479216400 + 8247143342656 = 3668580^2 + 2871784^2 .

It is a super-2 number, since 2×21705622559056² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21705622558988 and 21705622559006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21705622559059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678300704955 + ... + 678300704986.

Almost surely, 2^{21705622559056} is an apocalyptic number.

It is an amenable number.

21705622559056 is a deficient number, since it is larger than the sum of its proper divisors (20349021149146).

21705622559056 is a wasteful number, since it uses less digits than its factorization.

21705622559056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356601409949 (or 1356601409943 counting only the distinct ones).

The product of its (nonzero) digits is 11340000, while the sum is 55.

The spelling of 21705622559056 in words is "twenty-one trillion, seven hundred five billion, six hundred twenty-two million, five hundred fifty-nine thousand, fifty-six".