23551321 has 2 divisors, whose sum is σ = 23551322. Its totient is φ = 23551320.

The previous prime is 23551313. The next prime is 23551357. The reversal of 23551321 is 12315532.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22695696 + 855625 = 4764^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 23551321 - 2³ = 23551313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23551292 and 23551301.

It is not a weakly prime, because it can be changed into another prime (23551361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11775660 + 11775661.

It is an arithmetic number, because the mean of its divisors is an integer number (11775661).

Almost surely, 2^23551321 is an apocalyptic number.

It is an amenable number.

23551321 is a deficient number, since it is larger than the sum of its proper divisors (1).

23551321 is an equidigital number, since it uses as much as digits as its factorization.

23551321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 900, while the sum is 22.

The square root of 23551321 is about 4852.9703275417. The cubic root of 23551321 is about 286.6410750245.

Adding to 23551321 its reverse (12315532), we get a palindrome (35866853).

The spelling of 23551321 in words is "twenty-three million, five hundred fifty-one thousand, three hundred twenty-one".