23407221 has 16 divisors (see below), whose sum is σ = 33062400. Its totient is φ = 14689008.

The previous prime is 23407217. The next prime is 23407253. The reversal of 23407221 is 12270432.

It is not a de Polignac number, because 23407221 - 2² = 23407217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23407271) 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 15 ways as a sum of consecutive naturals, for example, 8290 + ... + 10748.

It is an arithmetic number, because the mean of its divisors is an integer number (2066400).

Almost surely, 2^23407221 is an apocalyptic number.

It is an amenable number.

23407221 is a deficient number, since it is larger than the sum of its proper divisors (9655179).

23407221 is a wasteful number, since it uses less digits than its factorization.

23407221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2648.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 23407221 is about 4838.1009704222. The cubic root of 23407221 is about 286.0552691204.

Adding to 23407221 its reverse (12270432), we get a palindrome (35677653).

The spelling of 23407221 in words is "twenty-three million, four hundred seven thousand, two hundred twenty-one".