23656221 has 12 divisors (see below), whose sum is σ = 35004060. Its totient is φ = 15385920.

The previous prime is 23656219. The next prime is 23656223. The reversal of 23656221 is 12265632.

23656221 is a `hidden beast` number, since 2 + 3 + 656 + 2 + 2 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (23656219) and next prime (23656223).

It can be written as a sum of positive squares in 2 ways, for example, as 13505625 + 10150596 = 3675^2 + 3186^2 .

It is not a de Polignac number, because 23656221 - 2¹ = 23656219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23656223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31686 + ... + 32423.

It is an arithmetic number, because the mean of its divisors is an integer number (2917005).

Almost surely, 2^23656221 is an apocalyptic number.

It is an amenable number.

23656221 is a deficient number, since it is larger than the sum of its proper divisors (11347839).

23656221 is a wasteful number, since it uses less digits than its factorization.

23656221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64156 (or 64153 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 23656221 is about 4863.7661333580. The cubic root of 23656221 is about 287.0660209820.

The spelling of 23656221 in words is "twenty-three million, six hundred fifty-six thousand, two hundred twenty-one".