23149721 has 8 divisors (see below), whose sum is σ = 26554560. Its totient is φ = 19769328.

The previous prime is 23149717. The next prime is 23149723. The reversal of 23149721 is 12794132.

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 23149721 - 2² = 23149717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23149723) 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, 4031 + ... + 7908.

It is an arithmetic number, because the mean of its divisors is an integer number (3319320).

Almost surely, 2^23149721 is an apocalyptic number.

It is an amenable number.

23149721 is a deficient number, since it is larger than the sum of its proper divisors (3404839).

23149721 is a wasteful number, since it uses less digits than its factorization.

23149721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12223.

The product of its digits is 3024, while the sum is 29.

The square root of 23149721 is about 4811.4156960296. The cubic root of 23149721 is about 285.0024458598.

The spelling of 23149721 in words is "twenty-three million, one hundred forty-nine thousand, seven hundred twenty-one".