22021562636021 has 8 divisors (see below), whose sum is σ = 25110560110104. Its totient is φ = 19131855321600.

The previous prime is 22021562635973. The next prime is 22021562636023. The reversal of 22021562636021 is 12063626512022.

It can be written as a sum of positive squares in 4 ways, for example, as 449857269796 + 21571705366225 = 670714^2 + 4644535^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22021562636021 - 2³⁰ = 22020488894197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021562636023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49822539680 + ... + 49822540121.

It is an arithmetic number, because the mean of its divisors is an integer number (3138820013763).

Almost surely, 2^{22021562636021} is an apocalyptic number.

It is an amenable number.

22021562636021 is a deficient number, since it is larger than the sum of its proper divisors (3088997474083).

22021562636021 is a wasteful number, since it uses less digits than its factorization.

22021562636021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99645079831.

The product of its (nonzero) digits is 103680, while the sum is 38.

The spelling of 22021562636021 in words is "twenty-two trillion, twenty-one billion, five hundred sixty-two million, six hundred thirty-six thousand, twenty-one".