21331312323113 has 6 divisors (see below), whose sum is σ = 23098403284974. Its totient is φ = 19690442144256.

The previous prime is 21331312323091. The next prime is 21331312323133. The reversal of 21331312323113 is 31132321313312.

It can be written as a sum of positive squares in 3 ways, for example, as 1110848545024 + 20220463778089 = 1053968^2 + 4496717^2 .

It is not a de Polignac number, because 21331312323113 - 2⁴⁴ = 3739126278697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21331312323133) 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, 63110391320 + ... + 63110391657.

It is an arithmetic number, because the mean of its divisors is an integer number (3849733880829).

Almost surely, 2^{21331312323113} is an apocalyptic number.

It is an amenable number.

21331312323113 is a deficient number, since it is larger than the sum of its proper divisors (1767090961861).

21331312323113 is a wasteful number, since it uses less digits than its factorization.

21331312323113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126220783003 (or 126220782990 counting only the distinct ones).

The product of its digits is 5832, while the sum is 29.

Adding to 21331312323113 its reverse (31132321313312), we get a palindrome (52463633636425).

The spelling of 21331312323113 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred twelve million, three hundred twenty-three thousand, one hundred thirteen".