23401521 has 96 divisors (see below), whose sum is σ = 44688000. Its totient is φ = 11975040.

The previous prime is 23401519. The next prime is 23401523. The reversal of 23401521 is 12510432.

It is an interprime number because it is at equal distance from previous prime (23401519) and next prime (23401523).

It is not a de Polignac number, because 23401521 - 2¹ = 23401519 is a prime.

It is a super-2 number, since 2×23401521² = 1095262370226882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23401494 and 23401503.

It is not an unprimeable number, because it can be changed into a prime (23401523) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 806935 + ... + 806963.

It is an arithmetic number, because the mean of its divisors is an integer number (465500).

Almost surely, 2^23401521 is an apocalyptic number.

It is an amenable number.

23401521 is a deficient number, since it is larger than the sum of its proper divisors (21286479).

23401521 is a wasteful number, since it uses less digits than its factorization.

23401521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 23401521 is about 4837.5118604506. The cubic root of 23401521 is about 286.0320476908.

Adding to 23401521 its reverse (12510432), we get a palindrome (35911953).

The spelling of 23401521 in words is "twenty-three million, four hundred one thousand, five hundred twenty-one".