23427921 has 16 divisors (see below), whose sum is σ = 36082368. Its totient is φ = 13363200.

The previous prime is 23427913. The next prime is 23427923. The reversal of 23427921 is 12972432.

It is not a de Polignac number, because 23427921 - 2³ = 23427913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23427923) 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, 20320 + ... + 21441.

It is an arithmetic number, because the mean of its divisors is an integer number (2255148).

Almost surely, 2^23427921 is an apocalyptic number.

It is an amenable number.

23427921 is a deficient number, since it is larger than the sum of its proper divisors (12654447).

23427921 is a wasteful number, since it uses less digits than its factorization.

23427921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41792.

The product of its digits is 6048, while the sum is 30.

The square root of 23427921 is about 4840.2397667884. The cubic root of 23427921 is about 286.1395678849.

The spelling of 23427921 in words is "twenty-three million, four hundred twenty-seven thousand, nine hundred twenty-one".