23499221 has 4 divisors (see below), whose sum is σ = 23643552. Its totient is φ = 23354892.

The previous prime is 23499167. The next prime is 23499227. The reversal of 23499221 is 12299432.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23499221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23499227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71921 + ... + 72246.

It is an arithmetic number, because the mean of its divisors is an integer number (5910888).

Almost surely, 2^23499221 is an apocalyptic number.

It is an amenable number.

23499221 is a deficient number, since it is larger than the sum of its proper divisors (144331).

23499221 is a wasteful number, since it uses less digits than its factorization.

23499221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144330.

The product of its digits is 7776, while the sum is 32.

The square root of 23499221 is about 4847.5995090354. The cubic root of 23499221 is about 286.4295507842.

The spelling of 23499221 in words is "twenty-three million, four hundred ninety-nine thousand, two hundred twenty-one".