25290321 has 24 divisors (see below), whose sum is σ = 40148064. Its totient is φ = 14112000.

The previous prime is 25290319. The next prime is 25290323. The reversal of 25290321 is 12309252.

25290321 = T₁₀₆₃ + T₁₀₆₄ + ... + T₁₁₀₅.

It is an interprime number because it is at equal distance from previous prime (25290319) and next prime (25290323).

It is not a de Polignac number, because 25290321 - 2¹ = 25290319 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25290291 and 25290300.

It is not an unprimeable number, because it can be changed into a prime (25290323) 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 23 ways as a sum of consecutive naturals, for example, 4321 + ... + 8321.

It is an arithmetic number, because the mean of its divisors is an integer number (1672836).

Almost surely, 2^25290321 is an apocalyptic number.

25290321 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

25290321 is a deficient number, since it is larger than the sum of its proper divisors (14857743).

25290321 is a wasteful number, since it uses less digits than its factorization.

25290321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4061 (or 4054 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 25290321 is about 5028.9482995951. The cubic root of 25290321 is about 293.5292921282.

Adding to 25290321 its reverse (12309252), we get a palindrome (37599573).

The spelling of 25290321 in words is "twenty-five million, two hundred ninety thousand, three hundred twenty-one".