21313010131 has 4 divisors (see below), whose sum is σ = 24357725872. Its totient is φ = 18268294392.

The previous prime is 21313010119. The next prime is 21313010171. The reversal of 21313010131 is 13101031312.

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

It is a cyclic number.

It is not a de Polignac number, because 21313010131 - 2²¹ = 21310912979 is a prime.

It is a super-2 number, since 2×21313010131² (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 (21313010171) 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, 1522357860 + ... + 1522357873.

It is an arithmetic number, because the mean of its divisors is an integer number (6089431468).

Almost surely, 2^21313010131 is an apocalyptic number.

21313010131 is a deficient number, since it is larger than the sum of its proper divisors (3044715741).

21313010131 is an equidigital number, since it uses as much as digits as its factorization.

21313010131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3044715740.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21313010131 its reverse (13101031312), we get a palindrome (34414041443).

The spelling of 21313010131 in words is "twenty-one billion, three hundred thirteen million, ten thousand, one hundred thirty-one".