23171621 has 12 divisors (see below), whose sum is σ = 26812800. Its totient is φ = 19954440.

The previous prime is 23171597. The next prime is 23171623. The reversal of 23171621 is 12617132.

It is not a de Polignac number, because 23171621 - 2¹⁰ = 23170597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23171623) 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, 2741 + ... + 7338.

It is an arithmetic number, because the mean of its divisors is an integer number (2234400).

Almost surely, 2^23171621 is an apocalyptic number.

It is an amenable number.

23171621 is a deficient number, since it is larger than the sum of its proper divisors (3641179).

23171621 is a wasteful number, since it uses less digits than its factorization.

23171621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10120 (or 10109 counting only the distinct ones).

The product of its digits is 504, while the sum is 23.

The square root of 23171621 is about 4813.6909954836. The cubic root of 23171621 is about 285.0922897992.

Adding to 23171621 its reverse (12617132), we get a palindrome (35788753).

The spelling of 23171621 in words is "twenty-three million, one hundred seventy-one thousand, six hundred twenty-one".