23431421 has 8 divisors (see below), whose sum is σ = 25277784. Its totient is φ = 21591360.

The previous prime is 23431409. The next prime is 23431433. The reversal of 23431421 is 12413432.

It is an interprime number because it is at equal distance from previous prime (23431409) and next prime (23431433).

It can be written as a sum of positive squares in 4 ways, for example, as 343396 + 23088025 = 586^2 + 4805^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23431421 - 2⁶ = 23431357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23431393 and 23431402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23431451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8651 + ... + 11031.

It is an arithmetic number, because the mean of its divisors is an integer number (3159723).

Almost surely, 2^23431421 is an apocalyptic number.

It is an amenable number.

23431421 is a deficient number, since it is larger than the sum of its proper divisors (1846363).

23431421 is a wasteful number, since it uses less digits than its factorization.

23431421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3151.

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

The square root of 23431421 is about 4840.6013056231. The cubic root of 23431421 is about 286.1538163909.

Adding to 23431421 its reverse (12413432), we get a palindrome (35844853).

The spelling of 23431421 in words is "twenty-three million, four hundred thirty-one thousand, four hundred twenty-one".