23131121321 has 16 divisors (see below), whose sum is σ = 30092663808. Its totient is φ = 17240586000.

The previous prime is 23131121309. The next prime is 23131121327. The reversal of 23131121321 is 12312113132.

It is a happy number.

It is not a de Polignac number, because 23131121321 - 2⁶ = 23131121257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23131121293 and 23131121302.

It is not an unprimeable number, because it can be changed into a prime (23131121327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6528755 + ... + 6532296.

It is an arithmetic number, because the mean of its divisors is an integer number (1880791488).

Almost surely, 2^23131121321 is an apocalyptic number.

It is an amenable number.

23131121321 is a deficient number, since it is larger than the sum of its proper divisors (6961542487).

23131121321 is a wasteful number, since it uses less digits than its factorization.

23131121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13061092.

The product of its digits is 216, while the sum is 20.

Adding to 23131121321 its reverse (12312113132), we get a palindrome (35443234453).

The spelling of 23131121321 in words is "twenty-three billion, one hundred thirty-one million, one hundred twenty-one thousand, three hundred twenty-one".