21310113313 has 4 divisors (see below), whose sum is σ = 21311926960. Its totient is φ = 21308299668.

The previous prime is 21310113289. The next prime is 21310113359. The reversal of 21310113313 is 31331101312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21310113313 - 2²¹ = 21308016161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310110313) 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, 889083 + ... + 912736.

It is an arithmetic number, because the mean of its divisors is an integer number (5327981740).

Almost surely, 2^21310113313 is an apocalyptic number.

It is an amenable number.

21310113313 is a deficient number, since it is larger than the sum of its proper divisors (1813647).

21310113313 is a wasteful number, since it uses less digits than its factorization.

21310113313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813646.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 21310113313 its reverse (31331101312), we get a palindrome (52641214625).

The spelling of 21310113313 in words is "twenty-one billion, three hundred ten million, one hundred thirteen thousand, three hundred thirteen".