23131130321 has 4 divisors (see below), whose sum is σ = 24910448052. Its totient is φ = 21351812592.

The previous prime is 23131130303. The next prime is 23131130357. The reversal of 23131130321 is 12303113132.

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 1479479296 + 21651651025 = 38464^2 + 147145^2 .

It is a cyclic number.

It is not a de Polignac number, because 23131130321 - 2²⁶ = 23064021457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23131130293 and 23131130302.

It is not an unprimeable number, because it can be changed into a prime (23131130371) 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, 889658846 + ... + 889658871.

It is an arithmetic number, because the mean of its divisors is an integer number (6227612013).

Almost surely, 2^23131130321 is an apocalyptic number.

It is an amenable number.

23131130321 is a deficient number, since it is larger than the sum of its proper divisors (1779317731).

23131130321 is a wasteful number, since it uses less digits than its factorization.

23131130321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779317730.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 23131130321 its reverse (12303113132), we get a palindrome (35434243453).

The spelling of 23131130321 in words is "twenty-three billion, one hundred thirty-one million, one hundred thirty thousand, three hundred twenty-one".