23021431 has 2 divisors, whose sum is σ = 23021432. Its totient is φ = 23021430.

The previous prime is 23021423. The next prime is 23021441. The reversal of 23021431 is 13412032.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23021431 - 2³ = 23021423 is a prime.

It is a super-2 number, since 2×23021431² = 1059972570575522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23021441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11510715 + 11510716.

It is an arithmetic number, because the mean of its divisors is an integer number (11510716).

Almost surely, 2^23021431 is an apocalyptic number.

23021431 is a deficient number, since it is larger than the sum of its proper divisors (1).

23021431 is an equidigital number, since it uses as much as digits as its factorization.

23021431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 23021431 is about 4798.0653392800. The cubic root of 23021431 is about 284.4749994247.

Adding to 23021431 its reverse (13412032), we get a palindrome (36433463).

The spelling of 23021431 in words is "twenty-three million, twenty-one thousand, four hundred thirty-one".