25321221 has 8 divisors (see below), whose sum is σ = 37512960. Its totient is φ = 16880796.

The previous prime is 25321201. The next prime is 25321237. The reversal of 25321221 is 12212352.

It is not a de Polignac number, because 25321221 - 2⁶ = 25321157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25321194 and 25321203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25321201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468885 + ... + 468938.

It is an arithmetic number, because the mean of its divisors is an integer number (4689120).

Almost surely, 2^25321221 is an apocalyptic number.

It is an amenable number.

25321221 is a deficient number, since it is larger than the sum of its proper divisors (12191739).

25321221 is an equidigital number, since it uses as much as digits as its factorization.

25321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937832 (or 937826 counting only the distinct ones).

The product of its digits is 240, while the sum is 18.

The square root of 25321221 is about 5032.0195746837. The cubic root of 25321221 is about 293.6487892758.

Adding to 25321221 its reverse (12212352), we get a palindrome (37533573).

The spelling of 25321221 in words is "twenty-five million, three hundred twenty-one thousand, two hundred twenty-one".