23121131321 has 2 divisors, whose sum is σ = 23121131322. Its totient is φ = 23121131320.

The previous prime is 23121131251. The next prime is 23121131329. The reversal of 23121131321 is 12313112132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23104000000 + 17131321 = 152000^2 + 4139^2 .

It is a cyclic number.

It is not a de Polignac number, because 23121131321 - 2²² = 23116937017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23121131293 and 23121131302.

It is not a weakly prime, because it can be changed into another prime (23121131329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560565660 + 11560565661.

It is an arithmetic number, because the mean of its divisors is an integer number (11560565661).

Almost surely, 2^23121131321 is an apocalyptic number.

It is an amenable number.

23121131321 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121131321 is an equidigital number, since it uses as much as digits as its factorization.

23121131321 is an evil number, because the sum of its binary digits is even.

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

Adding to 23121131321 its reverse (12313112132), we get a palindrome (35434243453).

The spelling of 23121131321 in words is "twenty-three billion, one hundred twenty-one million, one hundred thirty-one thousand, three hundred twenty-one".