25221120 has 96 divisors (see below), whose sum is σ = 80786160. Its totient is φ = 6717440.

The previous prime is 25221103. The next prime is 25221137. The reversal of 25221120 is 2112252.

It is an interprime number because it is at equal distance from previous prime (25221103) and next prime (25221137).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×25221120² = 1272209788108800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 25221120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30310 + ... + 31130.

Almost surely, 2^25221120 is an apocalyptic number.

25221120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25221120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40393080).

25221120 is an abundant number, since it is smaller than the sum of its proper divisors (55565040).

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

25221120 is an equidigital number, since it uses as much as digits as its factorization.

25221120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 25221120 is about 5022.0633209867. The cubic root of 25221120 is about 293.2613230032.

Adding to 25221120 its reverse (2112252), we get a palindrome (27333372).

The spelling of 25221120 in words is "twenty-five million, two hundred twenty-one thousand, one hundred twenty".