25021057 has 4 divisors (see below), whose sum is σ = 25032196. Its totient is φ = 25009920.

The previous prime is 25021037. The next prime is 25021063. The reversal of 25021057 is 75012052.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4626801 + 20394256 = 2151^2 + 4516^2 .

It is a cyclic number.

It is not a de Polignac number, because 25021057 - 2²³ = 16632449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25021027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 888 + ... + 7129.

It is an arithmetic number, because the mean of its divisors is an integer number (6258049).

Almost surely, 2^25021057 is an apocalyptic number.

It is an amenable number.

25021057 is a deficient number, since it is larger than the sum of its proper divisors (11139).

25021057 is an equidigital number, since it uses as much as digits as its factorization.

25021057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11138.

The product of its (nonzero) digits is 700, while the sum is 22.

The square root of 25021057 is about 5002.1052567894. The cubic root of 25021057 is about 292.4838455052.

The spelling of 25021057 in words is "twenty-five million, twenty-one thousand, fifty-seven".