23036221 has 6 divisors (see below), whose sum is σ = 24944730. Its totient is φ = 21264048.

The previous prime is 23036213. The next prime is 23036249. The reversal of 23036221 is 12263032.

It can be written as a sum of positive squares in 3 ways, for example, as 1413721 + 21622500 = 1189^2 + 4650^2 .

It is not a de Polignac number, because 23036221 - 2³ = 23036213 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 (23036281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67986 + ... + 68323.

It is an arithmetic number, because the mean of its divisors is an integer number (4157455).

Almost surely, 2^23036221 is an apocalyptic number.

It is an amenable number.

23036221 is a deficient number, since it is larger than the sum of its proper divisors (1908509).

23036221 is a wasteful number, since it uses less digits than its factorization.

23036221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136335 (or 136322 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 23036221 is about 4799.6063380240. The cubic root of 23036221 is about 284.5359062171.

Adding to 23036221 its reverse (12263032), we get a palindrome (35299253).

The spelling of 23036221 in words is "twenty-three million, thirty-six thousand, two hundred twenty-one".