21661032164022 has 24 divisors (see below), whose sum is σ = 46934533137960. Its totient is φ = 7219990703520.

The previous prime is 21661032164017. The next prime is 21661032164027. The reversal of 21661032164022 is 22046123016612.

21661032164022 is a `hidden beast` number, since 2 + 1 + 6 + 6 + 1 + 0 + 3 + 2 + 1 + 640 + 2 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21661032164017) and next prime (21661032164027).

It is a super-2 number, since 2×21661032164022² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21661032164027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29067772 + ... + 29803647.

It is an arithmetic number, because the mean of its divisors is an integer number (1955605547415).

Almost surely, 2^{21661032164022} is an apocalyptic number.

21661032164022 is an abundant number, since it is smaller than the sum of its proper divisors (25273500973938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21661032164022 is a wasteful number, since it uses less digits than its factorization.

21661032164022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58891868 (or 58891865 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 21661032164022 in words is "twenty-one trillion, six hundred sixty-one billion, thirty-two million, one hundred sixty-four thousand, twenty-two".