22021563651521 has 16 divisors (see below), whose sum is σ = 25200165992448. Its totient is φ = 18851143348800.

The previous prime is 22021563651517. The next prime is 22021563651541. The reversal of 22021563651521 is 12515636512022.

It is not a de Polignac number, because 22021563651521 - 2² = 22021563651517 is a prime.

It is a super-2 number, since 2×22021563651521² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22021563651541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16031771 + ... + 17351103.

It is an arithmetic number, because the mean of its divisors is an integer number (1575010374528).

Almost surely, 2^{22021563651521} is an apocalyptic number.

It is an amenable number.

22021563651521 is a deficient number, since it is larger than the sum of its proper divisors (3178602340927).

22021563651521 is a wasteful number, since it uses less digits than its factorization.

22021563651521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322432.

The product of its (nonzero) digits is 216000, while the sum is 41.

The spelling of 22021563651521 in words is "twenty-two trillion, twenty-one billion, five hundred sixty-three million, six hundred fifty-one thousand, five hundred twenty-one".