22021563646556 has 24 divisors (see below), whose sum is σ = 38674527722544. Its totient is φ = 10971699822720.

The previous prime is 22021563646543. The next prime is 22021563646559. The reversal of 22021563646556 is 65564636512022.

It is a super-2 number, since 2×22021563646556² (a number of 27 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 22021563646498 and 22021563646507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021563646559) 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, 99066896 + ... + 99288936.

It is an arithmetic number, because the mean of its divisors is an integer number (1611438655106).

Almost surely, 2^{22021563646556} is an apocalyptic number.

It is an amenable number.

22021563646556 is a deficient number, since it is larger than the sum of its proper divisors (16652964075988).

22021563646556 is a wasteful number, since it uses less digits than its factorization.

22021563646556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309941 (or 309939 counting only the distinct ones).

The product of its (nonzero) digits is 15552000, while the sum is 53.

The spelling of 22021563646556 in words is "twenty-two trillion, twenty-one billion, five hundred sixty-three million, six hundred forty-six thousand, five hundred fifty-six".