25221236 has 6 divisors (see below), whose sum is σ = 44137170. Its totient is φ = 12610616.

The previous prime is 25221223. The next prime is 25221239. The reversal of 25221236 is 63212252.

It can be written as a sum of positive squares in only one way, i.e., 23136100 + 2085136 = 4810^2 + 1444^2 .

It is a super-2 number, since 2×25221236² = 1272221490735392, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3152651 + ... + 3152658.

It is an arithmetic number, because the mean of its divisors is an integer number (7356195).

Almost surely, 2^25221236 is an apocalyptic number.

It is an amenable number.

25221236 is a deficient number, since it is larger than the sum of its proper divisors (18915934).

25221236 is a wasteful number, since it uses less digits than its factorization.

25221236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6305313 (or 6305311 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 25221236 is about 5022.0748700114. The cubic root of 25221236 is about 293.2617726034.

Adding to 25221236 its reverse (63212252), we get a palindrome (88433488).

The spelling of 25221236 in words is "twenty-five million, two hundred twenty-one thousand, two hundred thirty-six".