25221825 has 18 divisors (see below), whose sum is σ = 45175494. Its totient is φ = 13451520.

The previous prime is 25221787. The next prime is 25221839. The reversal of 25221825 is 52812252.

It can be written as a sum of positive squares in 3 ways, for example, as 1718721 + 23503104 = 1311^2 + 4848^2 .

It is not a de Polignac number, because 25221825 - 2²⁰ = 24173249 is a prime.

It is a super-2 number, since 2×25221825² = 1272280912661250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 55824 + ... + 56273.

Almost surely, 2^25221825 is an apocalyptic number.

25221825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25221825 is a deficient number, since it is larger than the sum of its proper divisors (19953669).

25221825 is a wasteful number, since it uses less digits than its factorization.

25221825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112113 (or 112105 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 25221825 is about 5022.1335107701. The cubic root of 25221825 is about 293.2640554658.

The spelling of 25221825 in words is "twenty-five million, two hundred twenty-one thousand, eight hundred twenty-five".