23231321 has 2 divisors, whose sum is σ = 23231322. Its totient is φ = 23231320.

The previous prime is 23231317. The next prime is 23231323. The reversal of 23231321 is 12313232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19678096 + 3553225 = 4436^2 + 1885^2 .

It is a cyclic number.

It is not a de Polignac number, because 23231321 - 2² = 23231317 is a prime.

Together with 23231323, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23231321.

It is not a weakly prime, because it can be changed into another prime (23231323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11615660 + 11615661.

It is an arithmetic number, because the mean of its divisors is an integer number (11615661).

Almost surely, 2^23231321 is an apocalyptic number.

It is an amenable number.

23231321 is a deficient number, since it is larger than the sum of its proper divisors (1).

23231321 is an equidigital number, since it uses as much as digits as its factorization.

23231321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 17.

The square root of 23231321 is about 4819.8880692398. Note that the first 3 decimals coincide. The cubic root of 23231321 is about 285.3369196944.

Adding to 23231321 its reverse (12313232), we get a palindrome (35544553).

It can be divided in two parts, 2 and 3231321, that added together give a palindrome (3231323).

The spelling of 23231321 in words is "twenty-three million, two hundred thirty-one thousand, three hundred twenty-one".