25221536 has 12 divisors (see below), whose sum is σ = 49654962. Its totient is φ = 12610752.

The previous prime is 25221533. The next prime is 25221541. The reversal of 25221536 is 63512252.

It can be written as a sum of positive squares in only one way, i.e., 16483600 + 8737936 = 4060^2 + 2956^2 .

It is a super-2 number, since 2×25221536² = 1272251756398592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (25221533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 394055 + ... + 394118.

Almost surely, 2^25221536 is an apocalyptic number.

It is an amenable number.

25221536 is a deficient number, since it is larger than the sum of its proper divisors (24433426).

25221536 is an equidigital number, since it uses as much as digits as its factorization.

25221536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788183 (or 788175 counting only the distinct ones).

The product of its digits is 3600, while the sum is 26.

The square root of 25221536 is about 5022.1047380555. The cubic root of 25221536 is about 293.2629353561.

Adding to 25221536 its reverse (63512252), we get a palindrome (88733788).

The spelling of 25221536 in words is "twenty-five million, two hundred twenty-one thousand, five hundred thirty-six".