25284921 has 4 divisors (see below), whose sum is σ = 33713232. Its totient is φ = 16856612.

The previous prime is 25284907. The next prime is 25284923. The reversal of 25284921 is 12948252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25284921 - 2⁷ = 25284793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25284923) 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 3 ways as a sum of consecutive naturals, for example, 4214151 + ... + 4214156.

It is an arithmetic number, because the mean of its divisors is an integer number (8428308).

Almost surely, 2^25284921 is an apocalyptic number.

It is an amenable number.

25284921 is a deficient number, since it is larger than the sum of its proper divisors (8428311).

25284921 is an equidigital number, since it uses as much as digits as its factorization.

25284921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8428310.

The product of its digits is 11520, while the sum is 33.

The square root of 25284921 is about 5028.4113793523. The cubic root of 25284921 is about 293.5083991417.

The spelling of 25284921 in words is "twenty-five million, two hundred eighty-four thousand, nine hundred twenty-one".