23421431 has 4 divisors (see below), whose sum is σ = 25550664. Its totient is φ = 21292200.

The previous prime is 23421421. The next prime is 23421443. The reversal of 23421431 is 13412432.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23421431 - 2¹⁴ = 23405047 is a prime.

It is a super-2 number, since 2×23421431² = 1097126860175522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23421401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1064600 + ... + 1064621.

It is an arithmetic number, because the mean of its divisors is an integer number (6387666).

Almost surely, 2^23421431 is an apocalyptic number.

23421431 is a deficient number, since it is larger than the sum of its proper divisors (2129233).

23421431 is a wasteful number, since it uses less digits than its factorization.

23421431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129232.

The product of its digits is 576, while the sum is 20.

The square root of 23421431 is about 4839.5692990183. The cubic root of 23421431 is about 286.1131433279.

Adding to 23421431 its reverse (13412432), we get a palindrome (36833863).

It can be divided in two parts, 2342 and 1431, that added together give a palindrome (3773).

The spelling of 23421431 in words is "twenty-three million, four hundred twenty-one thousand, four hundred thirty-one".