25521212 has 12 divisors (see below), whose sum is σ = 45080280. Its totient is φ = 12641136.

The previous prime is 25521211. The next prime is 25521227. The reversal of 25521212 is 21212552.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25521211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29387 + ... + 30242.

It is an arithmetic number, because the mean of its divisors is an integer number (3756690).

Almost surely, 2^25521212 is an apocalyptic number.

It is an amenable number.

25521212 is a deficient number, since it is larger than the sum of its proper divisors (19559068).

25521212 is a wasteful number, since it uses less digits than its factorization.

25521212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59740 (or 59738 counting only the distinct ones).

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

The square root of 25521212 is about 5051.8523335505. The cubic root of 25521212 is about 294.4198576466.

Adding to 25521212 its reverse (21212552), we get a palindrome (46733764).

The spelling of 25521212 in words is "twenty-five million, five hundred twenty-one thousand, two hundred twelve".