23421591 has 6 divisors (see below), whose sum is σ = 33831200. Its totient is φ = 15614388.

The previous prime is 23421577. The next prime is 23421611. The reversal of 23421591 is 19512432.

It is not a de Polignac number, because 23421591 - 2¹³ = 23413399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23421511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1301191 + ... + 1301208.

Almost surely, 2^23421591 is an apocalyptic number.

23421591 is a deficient number, since it is larger than the sum of its proper divisors (10409609).

23421591 is a wasteful number, since it uses less digits than its factorization.

23421591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2602405 (or 2602402 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 23421591 is about 4839.5858293866. The cubic root of 23421591 is about 286.1137948394.

The spelling of 23421591 in words is "twenty-three million, four hundred twenty-one thousand, five hundred ninety-one".