25224921 has 12 divisors (see below), whose sum is σ = 36599472. Its totient is φ = 16741176.

The previous prime is 25224911. The next prime is 25224959. The reversal of 25224921 is 12942252.

It is a happy number.

It is not a de Polignac number, because 25224921 - 2¹⁴ = 25208537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25224911) 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, 4131 + ... + 8216.

It is an arithmetic number, because the mean of its divisors is an integer number (3049956).

Almost surely, 2^25224921 is an apocalyptic number.

It is an amenable number.

25224921 is a deficient number, since it is larger than the sum of its proper divisors (11374551).

25224921 is a wasteful number, since it uses less digits than its factorization.

25224921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12580 (or 12577 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 25224921 is about 5022.4417368447. The cubic root of 25224921 is about 293.2760544438.

The spelling of 25224921 in words is "twenty-five million, two hundred twenty-four thousand, nine hundred twenty-one".