25245221 has 4 divisors (see below), whose sum is σ = 26730252. Its totient is φ = 23760192.

The previous prime is 25245139. The next prime is 25245229. The reversal of 25245221 is 12254252.

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 10144225 + 15100996 = 3185^2 + 3886^2 .

It is a cyclic number.

It is not a de Polignac number, because 25245221 - 2¹⁴ = 25228837 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 (25245229) 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, 742490 + ... + 742523.

It is an arithmetic number, because the mean of its divisors is an integer number (6682563).

Almost surely, 2^25245221 is an apocalyptic number.

It is an amenable number.

25245221 is a deficient number, since it is larger than the sum of its proper divisors (1485031).

25245221 is a wasteful number, since it uses less digits than its factorization.

25245221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1485030.

The product of its digits is 1600, while the sum is 23.

The square root of 25245221 is about 5024.4622597846. The cubic root of 25245221 is about 293.3547055996.

Adding to 25245221 its reverse (12254252), we get a palindrome (37499473).

The spelling of 25245221 in words is "twenty-five million, two hundred forty-five thousand, two hundred twenty-one".