21556263162922 has 16 divisors (see below), whose sum is σ = 33208468564392. Its totient is φ = 10486776646080.

The previous prime is 21556263162899. The next prime is 21556263162943. The reversal of 21556263162922 is 22926136265512.

It can be written as a sum of positive squares in 4 ways, for example, as 21045165425001 + 511097737921 = 4587501^2 + 714911^2 .

It is a super-4 number, since 4×21556263162922⁴ (a number of 54 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21556263162922.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16289472 + ... + 17563012.

Almost surely, 2^{21556263162922} is an apocalyptic number.

21556263162922 is a deficient number, since it is larger than the sum of its proper divisors (11652205401470).

21556263162922 is a wasteful number, since it uses less digits than its factorization.

21556263162922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1502313.

The product of its digits is 4665600, while the sum is 52.

The spelling of 21556263162922 in words is "twenty-one trillion, five hundred fifty-six billion, two hundred sixty-three million, one hundred sixty-two thousand, nine hundred twenty-two".