25013221 has 8 divisors (see below), whose sum is σ = 25751840. Its totient is φ = 24277968.

The previous prime is 25013207. The next prime is 25013237. The reversal of 25013221 is 12231052.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25013221 - 2⁹ = 25012709 is a prime.

It is a super-2 number, since 2×25013221² = 1251322449589682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25013195 and 25013204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25013251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28690 + ... + 29548.

It is an arithmetic number, because the mean of its divisors is an integer number (3218980).

Almost surely, 2^25013221 is an apocalyptic number.

It is an amenable number.

25013221 is a deficient number, since it is larger than the sum of its proper divisors (738619).

25013221 is an equidigital number, since it uses as much as digits as its factorization.

25013221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 25013221 is about 5001.3219252514. The cubic root of 25013221 is about 292.4533093224.

Adding to 25013221 its reverse (12231052), we get a palindrome (37244273).

The spelling of 25013221 in words is "twenty-five million, thirteen thousand, two hundred twenty-one".