25320321 has 24 divisors (see below), whose sum is σ = 40458600. Its totient is φ = 15158016.

The previous prime is 25320319. The next prime is 25320349. The reversal of 25320321 is 12302352.

25320321 is a `hidden beast` number, since 25 + 320 + 321 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2852721 + 22467600 = 1689^2 + 4740^2 .

It is not a de Polignac number, because 25320321 - 2¹ = 25320319 is a prime.

It is a super-2 number, since 2×25320321² = 1282237311086082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25320294 and 25320303.

It is not an unprimeable number, because it can be changed into a prime (25320311) 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, 1405 + ... + 7253.

It is an arithmetic number, because the mean of its divisors is an integer number (1685775).

Almost surely, 2^25320321 is an apocalyptic number.

It is an amenable number.

25320321 is a deficient number, since it is larger than the sum of its proper divisors (15138279).

25320321 is a wasteful number, since it uses less digits than its factorization.

25320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5905 (or 5902 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 25320321 is about 5031.9301465740. The cubic root of 25320321 is about 293.6453101513.

Adding to 25320321 its reverse (12302352), we get a palindrome (37622673).

The spelling of 25320321 in words is "twenty-five million, three hundred twenty thousand, three hundred twenty-one".