25212125 has 16 divisors (see below), whose sum is σ = 31792176. Its totient is φ = 19960000.

The previous prime is 25212113. The next prime is 25212137. The reversal of 25212125 is 52121252.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25212113) and next prime (25212137).

It can be written as a sum of positive squares in 8 ways, for example, as 8655364 + 16556761 = 2942^2 + 4069^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25212125 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25212097 and 25212106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11627 + ... + 13623.

It is an arithmetic number, because the mean of its divisors is an integer number (1987011).

Almost surely, 2^25212125 is an apocalyptic number.

25212125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

25212125 is a deficient number, since it is larger than the sum of its proper divisors (6580051).

25212125 is a wasteful number, since it uses less digits than its factorization.

25212125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113 (or 2103 counting only the distinct ones).

The product of its digits is 400, while the sum is 20.

The square root of 25212125 is about 5021.1676928778. The cubic root of 25212125 is about 293.2264554099.

Adding to 25212125 its reverse (52121252), we get a palindrome (77333377).

It can be divided in two parts, 252121 and 25, that multiplied together give a triangular number (6303025 = T₃₅₅₀).

The spelling of 25212125 in words is "twenty-five million, two hundred twelve thousand, one hundred twenty-five".