225025021 has 12 divisors (see below), whose sum is σ = 244927200. Its totient is φ = 206640720.

The previous prime is 225024967. The next prime is 225025043. The reversal of 225025021 is 120520522.

It is not a de Polignac number, because 225025021 - 2²⁵ = 191470589 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 225025021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225025091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30286 + ... + 36976.

It is an arithmetic number, because the mean of its divisors is an integer number (20410600).

Almost surely, 2^225025021 is an apocalyptic number.

It is an amenable number.

225025021 is a deficient number, since it is larger than the sum of its proper divisors (19902179).

225025021 is a wasteful number, since it uses less digits than its factorization.

225025021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6916 (or 6903 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 225025021 is about 15000.8340101476. The cubic root of 225025021 is about 608.2427443181.

Adding to 225025021 its reverse (120520522), we get a palindrome (345545543).

The spelling of 225025021 in words is "two hundred twenty-five million, twenty-five thousand, twenty-one".