23010921 has 18 divisors (see below), whose sum is σ = 33703098. Its totient is φ = 15128640.

The previous prime is 23010913. The next prime is 23010941. The reversal of 23010921 is 12901032.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 1527696 = 4635^2 + 1236^2 .

It is not a de Polignac number, because 23010921 - 2³ = 23010913 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 23010894 and 23010903.

It is not an unprimeable number, because it can be changed into a prime (23010941) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 95361 + ... + 95601.

Almost surely, 2^23010921 is an apocalyptic number.

It is an amenable number.

23010921 is a deficient number, since it is larger than the sum of its proper divisors (10692177).

23010921 is a wasteful number, since it uses less digits than its factorization.

23010921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453 (or 347 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 23010921 is about 4796.9699811443. The cubic root of 23010921 is about 284.4317022705.

Adding to 23010921 its reverse (12901032), we get a palindrome (35911953).

The spelling of 23010921 in words is "twenty-three million, ten thousand, nine hundred twenty-one".