21312332113 has 4 divisors (see below), whose sum is σ = 21313913140. Its totient is φ = 21310751088.

The previous prime is 21312332101. The next prime is 21312332123. The reversal of 21312332113 is 31123321312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8718330384 + 12594001729 = 93372^2 + 112223^2 .

It is a cyclic number.

It is not a de Polignac number, because 21312332113 - 2¹⁷ = 21312201041 is a prime.

It is a super-2 number, since 2×21312332113² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21312332123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 770118 + ... + 797311.

It is an arithmetic number, because the mean of its divisors is an integer number (5328478285).

Almost surely, 2^21312332113 is an apocalyptic number.

It is an amenable number.

21312332113 is a deficient number, since it is larger than the sum of its proper divisors (1581027).

21312332113 is a wasteful number, since it uses less digits than its factorization.

21312332113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581026.

The product of its digits is 648, while the sum is 22.

Adding to 21312332113 its reverse (31123321312), we get a palindrome (52435653425).

The spelling of 21312332113 in words is "twenty-one billion, three hundred twelve million, three hundred thirty-two thousand, one hundred thirteen".