25221404 has 48 divisors (see below), whose sum is σ = 51000768. Its totient is φ = 10810368.

The previous prime is 25221403. The next prime is 25221407. The reversal of 25221404 is 40412252.

It is a happy number.

It is a super-2 number, since 2×25221404² = 1272238439462432, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90914 + ... + 91190.

It is an arithmetic number, because the mean of its divisors is an integer number (1062516).

Almost surely, 2^25221404 is an apocalyptic number.

It is an amenable number.

25221404 is an abundant number, since it is smaller than the sum of its proper divisors (25779364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25221404 is a wasteful number, since it uses less digits than its factorization.

25221404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 412 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 25221404 is about 5022.0915961380. The cubic root of 25221404 is about 293.2624237460.

Adding to 25221404 its reverse (40412252), we get a palindrome (65633656).

The spelling of 25221404 in words is "twenty-five million, two hundred twenty-one thousand, four hundred four".