25125021 has 12 divisors (see below), whose sum is σ = 36977148. Its totient is φ = 16433664.

The previous prime is 25125019. The next prime is 25125059. The reversal of 25125021 is 12052152.

It can be written as a sum of positive squares in 2 ways, for example, as 14333796 + 10791225 = 3786^2 + 3285^2 .

It is not a de Polignac number, because 25125021 - 2¹ = 25125019 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25124985 and 25125003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25125071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25860 + ... + 26813.

It is an arithmetic number, because the mean of its divisors is an integer number (3081429).

Almost surely, 2^25125021 is an apocalyptic number.

It is an amenable number.

25125021 is a deficient number, since it is larger than the sum of its proper divisors (11852127).

25125021 is a wasteful number, since it uses less digits than its factorization.

25125021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52732 (or 52729 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 25125021 is about 5012.4865087100. The cubic root of 25125021 is about 292.8883817332. Note that the first 3 decimals are identical.

Adding to 25125021 its reverse (12052152), we get a palindrome (37177173).

The spelling of 25125021 in words is "twenty-five million, one hundred twenty-five thousand, twenty-one".