25221265 has 24 divisors (see below), whose sum is σ = 32506920. Its totient is φ = 18779904.

The previous prime is 25221253. The next prime is 25221277. The reversal of 25221265 is 56212252.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25221253) and next prime (25221277).

It can be written as a sum of positive squares in 4 ways, for example, as 61009 + 25160256 = 247^2 + 5016^2 .

It is not a de Polignac number, because 25221265 - 2⁷ = 25221137 is a prime.

It is a super-2 number, since 2×25221265² = 1272224416400450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 160567 + ... + 160723.

It is an arithmetic number, because the mean of its divisors is an integer number (1354455).

Almost surely, 2^25221265 is an apocalyptic number.

It is an amenable number.

25221265 is a deficient number, since it is larger than the sum of its proper divisors (7285655).

25221265 is a wasteful number, since it uses less digits than its factorization.

25221265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 270 counting only the distinct ones).

The product of its digits is 2400, while the sum is 25.

The square root of 25221265 is about 5022.0777572634. The cubic root of 25221265 is about 293.2618850032.

The spelling of 25221265 in words is "twenty-five million, two hundred twenty-one thousand, two hundred sixty-five".