25221225 has 24 divisors (see below), whose sum is σ = 43515072. Its totient is φ = 12865600.

The previous prime is 25221223. The next prime is 25221239. The reversal of 25221225 is 52212252.

It is not a de Polignac number, because 25221225 - 2¹ = 25221223 is a prime.

It is a super-2 number, since 2×25221225² = 1272220381001250, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25221223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5586 + ... + 9035.

It is an arithmetic number, because the mean of its divisors is an integer number (1813128).

Almost surely, 2^25221225 is an apocalyptic number.

25221225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25221225 is a deficient number, since it is larger than the sum of its proper divisors (18293847).

25221225 is a wasteful number, since it uses less digits than its factorization.

25221225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14657 (or 14652 counting only the distinct ones).

The product of its digits is 800, while the sum is 21.

The square root of 25221225 is about 5022.0737748464. The cubic root of 25221225 is about 293.2617299689.

Adding to 25221225 its reverse (52212252), we get a palindrome (77433477).

The spelling of 25221225 in words is "twenty-five million, two hundred twenty-one thousand, two hundred twenty-five".