23221631 has 2 divisors, whose sum is σ = 23221632. Its totient is φ = 23221630.

The previous prime is 23221537. The next prime is 23221669. The reversal of 23221631 is 13612232.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23221631 - 2¹⁸ = 22959487 is a prime.

It is a super-2 number, since 2×23221631² = 1078488292600322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23221691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11610815 + 11610816.

It is an arithmetic number, because the mean of its divisors is an integer number (11610816).

Almost surely, 2^23221631 is an apocalyptic number.

23221631 is a deficient number, since it is larger than the sum of its proper divisors (1).

23221631 is an equidigital number, since it uses as much as digits as its factorization.

23221631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 20.

The square root of 23221631 is about 4818.8827543322. The cubic root of 23221631 is about 285.2972419498.

Adding to 23221631 its reverse (13612232), we get a palindrome (36833863).

The spelling of 23221631 in words is "twenty-three million, two hundred twenty-one thousand, six hundred thirty-one".