23221504 has 18 divisors (see below), whose sum is σ = 46352810. Its totient is φ = 11610624.

The previous prime is 23221487. The next prime is 23221531. The reversal of 23221504 is 40512232.

It can be written as a sum of positive squares in only one way, i.e., 22581504 + 640000 = 4752^2 + 800^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45099 + ... + 45610.

Almost surely, 2^23221504 is an apocalyptic number.

It is an amenable number.

23221504 is a deficient number, since it is larger than the sum of its proper divisors (23131306).

23221504 is an frugal number, since it uses more digits than its factorization.

23221504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90725 (or 90711 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 23221504 is about 4818.8695769859. The cubic root of 23221504 is about 285.2967218483.

Adding to 23221504 its reverse (40512232), we get a palindrome (63733736).

It can be divided in two parts, 232 and 21504, that added together give a triangular number (21736 = T₂₀₈).

The spelling of 23221504 in words is "twenty-three million, two hundred twenty-one thousand, five hundred four".