23021525 has 12 divisors (see below), whose sum is σ = 28672644. Its totient is φ = 18336000.

The previous prime is 23021513. The next prime is 23021533. The reversal of 23021525 is 52512032.

23021525 is nontrivially palindromic in base 4.

It can be written as a sum of positive squares in 6 ways, for example, as 1100401 + 21921124 = 1049^2 + 4682^2 .

It is not a de Polignac number, because 23021525 - 2¹⁸ = 22759381 is a prime.

It is a super-2 number, since 2×23021525² = 1059981226651250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23021497 and 23021506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4115 + ... + 7935.

It is an arithmetic number, because the mean of its divisors is an integer number (2389387).

Almost surely, 2^23021525 is an apocalyptic number.

23021525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

23021525 is a deficient number, since it is larger than the sum of its proper divisors (5651119).

23021525 is a wasteful number, since it uses less digits than its factorization.

23021525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4072 (or 4067 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 23021525 is about 4798.0751348848. The cubic root of 23021525 is about 284.4753866090.

Subtracting from 23021525 its sum of digits (20), we obtain a triangular number (23021505 = T₆₇₈₅).

Adding to 23021525 its reverse (52512032), we get a palindrome (75533557).

The spelling of 23021525 in words is "twenty-three million, twenty-one thousand, five hundred twenty-five".