21602340180564 has 192 divisors, whose sum is σ = 61157933211648. Its totient is φ = 5844811737600.

The previous prime is 21602340180497. The next prime is 21602340180593. The reversal of 21602340180564 is 46508104320612.

It is a super-2 number, since 2×21602340180564² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 109112487 + ... + 109310289.

It is an arithmetic number, because the mean of its divisors is an integer number (318530902144).

Almost surely, 2^{21602340180564} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21602340180564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30578966605824).

21602340180564 is an abundant number, since it is smaller than the sum of its proper divisors (39555593031084).

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

21602340180564 is a wasteful number, since it uses less digits than its factorization.

21602340180564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199918 (or 199916 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 42.

The spelling of 21602340180564 in words is "twenty-one trillion, six hundred two billion, three hundred forty million, one hundred eighty thousand, five hundred sixty-four".