25221136 has 10 divisors (see below), whose sum is σ = 48865982. Its totient is φ = 12610560.

The previous prime is 25221103. The next prime is 25221137. The reversal of 25221136 is 63112252.

It can be written as a sum of positive squares in only one way, i.e., 25200400 + 20736 = 5020^2 + 144^2 .

It is a super-2 number, since 2×25221136² = 1272211402260992, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25221137) 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 as a sum of consecutive naturals, namely, 788145 + ... + 788176.

Almost surely, 2^25221136 is an apocalyptic number.

It is an amenable number.

25221136 is a deficient number, since it is larger than the sum of its proper divisors (23644846).

25221136 is a wasteful number, since it uses less digits than its factorization.

25221136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576329 (or 1576323 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 25221136 is about 5022.0649139572. The cubic root of 25221136 is about 293.2613850171.

Adding to 25221136 its reverse (63112252), we get a palindrome (88333388).

The spelling of 25221136 in words is "twenty-five million, two hundred twenty-one thousand, one hundred thirty-six".