21312331313211 has 32 divisors (see below), whose sum is σ = 31684929239040. Its totient is φ = 14158233842400.

The previous prime is 21312331313201. The next prime is 21312331313213. The reversal of 21312331313211 is 11231313321312.

21312331313211 is a `hidden beast` number, since 2 + 1 + 3 + 1 + 2 + 331 + 3 + 1 + 321 + 1 = 666.

It is not a de Polignac number, because 21312331313211 - 2¹⁷ = 21312331182139 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21312331313213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77477526 + ... + 77752116.

It is an arithmetic number, because the mean of its divisors is an integer number (990154038720).

Almost surely, 2^{21312331313211} is an apocalyptic number.

21312331313211 is a deficient number, since it is larger than the sum of its proper divisors (10372597925829).

21312331313211 is a wasteful number, since it uses less digits than its factorization.

21312331313211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284704 (or 284698 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

Adding to 21312331313211 its reverse (11231313321312), we get a palindrome (32543644634523).

The spelling of 21312331313211 in words is "twenty-one trillion, three hundred twelve billion, three hundred thirty-one million, three hundred thirteen thousand, two hundred eleven".