25025221 has 4 divisors (see below), whose sum is σ = 26950252. Its totient is φ = 23100192.

The previous prime is 25025213. The next prime is 25025251. The reversal of 25025221 is 12252052.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10962721 + 14062500 = 3311^2 + 3750^2 .

It is a cyclic number.

It is not a de Polignac number, because 25025221 - 2³ = 25025213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25025251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 962496 + ... + 962521.

It is an arithmetic number, because the mean of its divisors is an integer number (6737563).

Almost surely, 2^25025221 is an apocalyptic number.

It is an amenable number.

25025221 is a deficient number, since it is larger than the sum of its proper divisors (1925031).

25025221 is a wasteful number, since it uses less digits than its factorization.

25025221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1925030.

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

The square root of 25025221 is about 5002.5214642218. The cubic root of 25025221 is about 292.5000696423.

Adding to 25025221 its reverse (12252052), we get a palindrome (37277273).

The spelling of 25025221 in words is "twenty-five million, twenty-five thousand, two hundred twenty-one".