21310211313 has 6 divisors (see below), whose sum is σ = 30781416354. Its totient is φ = 14206807536.

The previous prime is 21310211303. The next prime is 21310211381. The reversal of 21310211313 is 31311201312.

21310211313 is a `hidden beast` number, since 21 + 310 + 21 + 1 + 313 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21057782769 + 252428544 = 145113^2 + 15888^2 .

It is not a de Polignac number, because 21310211313 - 2⁵ = 21310211281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21310211303) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1183900620 + ... + 1183900637.

It is an arithmetic number, because the mean of its divisors is an integer number (5130236059).

Almost surely, 2^21310211313 is an apocalyptic number.

It is an amenable number.

21310211313 is a deficient number, since it is larger than the sum of its proper divisors (9471205041).

21310211313 is a wasteful number, since it uses less digits than its factorization.

21310211313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367801263 (or 2367801260 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21310211313 its reverse (31311201312), we get a palindrome (52621412625).

The spelling of 21310211313 in words is "twenty-one billion, three hundred ten million, two hundred eleven thousand, three hundred thirteen".