25421221 has 8 divisors (see below), whose sum is σ = 30582080. Its totient is φ = 20642688.

The previous prime is 25421161. The next prime is 25421237. The reversal of 25421221 is 12212452.

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 25421221 - 2⁷ = 25421093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25421251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95436 + ... + 95701.

It is an arithmetic number, because the mean of its divisors is an integer number (3822760).

Almost surely, 2^25421221 is an apocalyptic number.

It is an amenable number.

25421221 is a deficient number, since it is larger than the sum of its proper divisors (5160859).

25421221 is a wasteful number, since it uses less digits than its factorization.

25421221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191163.

The product of its digits is 320, while the sum is 19.

The square root of 25421221 is about 5041.9461520330. The cubic root of 25421221 is about 294.0348463178.

Adding to 25421221 its reverse (12212452), we get a palindrome (37633673).

The spelling of 25421221 in words is "twenty-five million, four hundred twenty-one thousand, two hundred twenty-one".