25221168 has 120 divisors (see below), whose sum is σ = 81709056. Its totient is φ = 7113600.

The previous prime is 25221137. The next prime is 25221173. The reversal of 25221168 is 86112252.

It is a happy number.

It is a super-2 number, since 2×25221168² = 1272214630568448, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 131953 + ... + 132143.

Almost surely, 2^25221168 is an apocalyptic number.

25221168 is a gapful number since it is divisible by the number (28) 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 25221168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40854528).

25221168 is an abundant number, since it is smaller than the sum of its proper divisors (56487888).

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

25221168 is a wasteful number, since it uses less digits than its factorization.

25221168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343 (or 334 counting only the distinct ones).

The product of its digits is 1920, while the sum is 27.

The square root of 25221168 is about 5022.0680998967. The cubic root of 25221168 is about 293.2615090448.

The spelling of 25221168 in words is "twenty-five million, two hundred twenty-one thousand, one hundred sixty-eight".