25221285 has 24 divisors (see below), whose sum is σ = 46289880. Its totient is φ = 12659712.

The previous prime is 25221283. The next prime is 25221307. The reversal of 25221285 is 58212252.

It can be written as a sum of positive squares in 4 ways, for example, as 3932289 + 21288996 = 1983^2 + 4614^2 .

It is not a de Polignac number, because 25221285 - 2¹ = 25221283 is a prime.

It is a super-2 number, since 2×25221285² = 1272226434102450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221283) 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, 15720 + ... + 17249.

It is an arithmetic number, because the mean of its divisors is an integer number (1928745).

Almost surely, 2^25221285 is an apocalyptic number.

It is an amenable number.

25221285 is a deficient number, since it is larger than the sum of its proper divisors (21068595).

25221285 is a wasteful number, since it uses less digits than its factorization.

25221285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32997 (or 32994 counting only the distinct ones).

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

The square root of 25221285 is about 5022.0797484707. The cubic root of 25221285 is about 293.2619625203.

The spelling of 25221285 in words is "twenty-five million, two hundred twenty-one thousand, two hundred eighty-five".