25171212 has 48 divisors (see below), whose sum is σ = 65649024. Its totient is φ = 7440000.

The previous prime is 25171207. The next prime is 25171213. The reversal of 25171212 is 21217152.

It is not an unprimeable number, because it can be changed into a prime (25171213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3087 + ... + 7737.

It is an arithmetic number, because the mean of its divisors is an integer number (1367688).

Almost surely, 2^25171212 is an apocalyptic number.

25171212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25171212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32824512).

25171212 is an abundant number, since it is smaller than the sum of its proper divisors (40477812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25171212 is a wasteful number, since it uses less digits than its factorization.

25171212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4710 (or 4708 counting only the distinct ones).

The product of its digits is 280, while the sum is 21.

The square root of 25171212 is about 5017.0919864001. The cubic root of 25171212 is about 293.0677583665.

Adding to 25171212 its reverse (21217152), we get a palindrome (46388364).

The spelling of 25171212 in words is "twenty-five million, one hundred seventy-one thousand, two hundred twelve".