21660562522100 has 36 divisors (see below), whose sum is σ = 47006621592000. Its totient is φ = 8663634977760.

The previous prime is 21660562522061. The next prime is 21660562522103. The reversal of 21660562522100 is 122526506612.

It is a happy number.

It is a super-2 number, since 2×21660562522100² (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 (21660562522103) 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, 5898140 + ... + 8837939.

Almost surely, 2^{21660562522100} is an apocalyptic number.

21660562522100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21660562522100 is an abundant number, since it is smaller than the sum of its proper divisors (25346059069900).

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

21660562522100 is a wasteful number, since it uses less digits than its factorization.

21660562522100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14750792 (or 14750785 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 21660562522100 in words is "twenty-one trillion, six hundred sixty billion, five hundred sixty-two million, five hundred twenty-two thousand, one hundred".