25653321 has 16 divisors (see below), whose sum is σ = 39033600. Its totient is φ = 16639344.

The previous prime is 25653307. The next prime is 25653343. The reversal of 25653321 is 12335652.

25653321 is a `hidden beast` number, since 2 + 5 + 653 + 3 + 2 + 1 = 666.

It is not a de Polignac number, because 25653321 - 2⁷ = 25653193 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25653301) 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 15 ways as a sum of consecutive naturals, for example, 11841 + ... + 13838.

It is an arithmetic number, because the mean of its divisors is an integer number (2439600).

Almost surely, 2^25653321 is an apocalyptic number.

It is an amenable number.

25653321 is a deficient number, since it is larger than the sum of its proper divisors (13380279).

25653321 is a wasteful number, since it uses less digits than its factorization.

25653321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25725 (or 25719 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 25653321 is about 5064.9107593323. The cubic root of 25653321 is about 294.9269990773.

Adding to 25653321 its reverse (12335652), we get a palindrome (37988973).

It can be divided in two parts, 2565 and 3321, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 25653321 in words is "twenty-five million, six hundred fifty-three thousand, three hundred twenty-one".