21312112201320 has 32 divisors (see below), whose sum is σ = 63936336604320. Its totient is φ = 5683229920320.

The previous prime is 21312112201313. The next prime is 21312112201327. The reversal of 21312112201320 is 2310221121312.

It is an interprime number because it is at equal distance from previous prime (21312112201313) and next prime (21312112201327).

It is a super-2 number, since 2×21312112201320² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21312112201327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88800467386 + ... + 88800467625.

It is an arithmetic number, because the mean of its divisors is an integer number (1998010518885).

Almost surely, 2^{21312112201320} is an apocalyptic number.

21312112201320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21312112201320 is an abundant number, since it is smaller than the sum of its proper divisors (42624224403000).

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

21312112201320 is a wasteful number, since it uses less digits than its factorization.

21312112201320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177600935025 (or 177600935021 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21312112201320 its reverse (2310221121312), we get a palindrome (23622333322632).

The spelling of 21312112201320 in words is "twenty-one trillion, three hundred twelve billion, one hundred twelve million, two hundred one thousand, three hundred twenty".