23206421 has 16 divisors (see below), whose sum is σ = 27433728. Its totient is φ = 19219200.

The previous prime is 23206399. The next prime is 23206433. The reversal of 23206421 is 12460232.

It is not a de Polignac number, because 23206421 - 2⁶ = 23206357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23206393 and 23206402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23206441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25901 + ... + 26781.

It is an arithmetic number, because the mean of its divisors is an integer number (1714608).

Almost surely, 2^23206421 is an apocalyptic number.

It is an amenable number.

23206421 is a deficient number, since it is larger than the sum of its proper divisors (4227307).

23206421 is an equidigital number, since it uses as much as digits as its factorization.

23206421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012.

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

The square root of 23206421 is about 4817.3043291866. The cubic root of 23206421 is about 285.2349391366.

Adding to 23206421 its reverse (12460232), we get a palindrome (35666653).

The spelling of 23206421 in words is "twenty-three million, two hundred six thousand, four hundred twenty-one".