25450221 has 8 divisors (see below), whose sum is σ = 33985504. Its totient is φ = 16940880.

The previous prime is 25450219. The next prime is 25450223. The reversal of 25450221 is 12205452.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25450219) and next prime (25450223).

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

It is not a de Polignac number, because 25450221 - 2¹ = 25450219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25450223) 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, 4066 + ... + 8211.

It is an arithmetic number, because the mean of its divisors is an integer number (4248188).

Almost surely, 2^25450221 is an apocalyptic number.

It is an amenable number.

25450221 is a deficient number, since it is larger than the sum of its proper divisors (8535283).

25450221 is a wasteful number, since it uses less digits than its factorization.

25450221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12971.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 25450221 is about 5044.8212059497. The cubic root of 25450221 is about 294.1466134397.

Adding to 25450221 its reverse (12205452), we get a palindrome (37655673).

The spelling of 25450221 in words is "twenty-five million, four hundred fifty thousand, two hundred twenty-one".