23121525 has 24 divisors (see below), whose sum is σ = 43689664. Its totient is φ = 10569600.

The previous prime is 23121521. The next prime is 23121557. The reversal of 23121525 is 52512132.

It is not a de Polignac number, because 23121525 - 2² = 23121521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23121521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21496 + ... + 22545.

Almost surely, 2^23121525 is an apocalyptic number.

23121525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

23121525 is a deficient number, since it is larger than the sum of its proper divisors (20568139).

23121525 is a wasteful number, since it uses less digits than its factorization.

23121525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44061 (or 44056 counting only the distinct ones).

The product of its digits is 600, while the sum is 21.

The square root of 23121525 is about 4808.4846885479. The cubic root of 23121525 is about 284.8866893356.

Adding to 23121525 its reverse (52512132), we get a palindrome (75633657).

The spelling of 23121525 in words is "twenty-three million, one hundred twenty-one thousand, five hundred twenty-five".