25221988 has 24 divisors (see below), whose sum is σ = 48432384. Its totient is φ = 11397600.

The previous prime is 25221979. The next prime is 25221991. The reversal of 25221988 is 88912252.

It is a super-2 number, since 2×25221988² = 1272297357344288, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6381 + ... + 9547.

It is an arithmetic number, because the mean of its divisors is an integer number (2018016).

Almost surely, 2^25221988 is an apocalyptic number.

It is an amenable number.

25221988 is a deficient number, since it is larger than the sum of its proper divisors (23210396).

25221988 is a wasteful number, since it uses less digits than its factorization.

25221988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3363 (or 3361 counting only the distinct ones).

The product of its digits is 23040, while the sum is 37.

The square root of 25221988 is about 5022.1497389066. The cubic root of 25221988 is about 293.2646872195.

The spelling of 25221988 in words is "twenty-five million, two hundred twenty-one thousand, nine hundred eighty-eight".