25221025 has 12 divisors (see below), whose sum is σ = 31806000. Its totient is φ = 19833680.

The previous prime is 25221023. The next prime is 25221043. The reversal of 25221025 is 52012252.

It is not a de Polignac number, because 25221025 - 2¹ = 25221023 is a prime.

It is a super-2 number, since 2×25221025² = 1272200204101250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25220993 and 25221011.

It is not an unprimeable number, because it can be changed into a prime (25221023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7075 + ... + 10024.

It is an arithmetic number, because the mean of its divisors is an integer number (2650500).

Almost surely, 2^25221025 is an apocalyptic number.

25221025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25221025 is a deficient number, since it is larger than the sum of its proper divisors (6584975).

25221025 is a wasteful number, since it uses less digits than its factorization.

25221025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17168 (or 17163 counting only the distinct ones).

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

The square root of 25221025 is about 5022.0538627139. The cubic root of 25221025 is about 293.2609547951.

Adding to 25221025 its reverse (52012252), we get a palindrome (77233277).

The spelling of 25221025 in words is "twenty-five million, two hundred twenty-one thousand, twenty-five".