21331130152164 has 96 divisors (see below), whose sum is σ = 60244457656320. Its totient is φ = 5734637056512.

The previous prime is 21331130152159. The next prime is 21331130152193. The reversal of 21331130152164 is 46125103113312.

It is a super-2 number, since 2×21331130152164² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3690519 + ... + 7502145.

It is an arithmetic number, because the mean of its divisors is an integer number (627546433920).

Almost surely, 2^{21331130152164} 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 21331130152164, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30122228828160).

21331130152164 is an abundant number, since it is smaller than the sum of its proper divisors (38913327504156).

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

21331130152164 is a wasteful number, since it uses less digits than its factorization.

21331130152164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3815577 (or 3815575 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 33.

Adding to 21331130152164 its reverse (46125103113312), we get a palindrome (67456233265476).

The spelling of 21331130152164 in words is "twenty-one trillion, three hundred thirty-one billion, one hundred thirty million, one hundred fifty-two thousand, one hundred sixty-four".