25221998 has 8 divisors (see below), whose sum is σ = 37968480. Its totient is φ = 12565840.

The previous prime is 25221997. The next prime is 25222013. The reversal of 25221998 is 89912252.

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

It is a super-2 number, since 2×25221998² = 1272298366224008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221991) 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 3 ways as a sum of consecutive naturals, for example, 21878 + ... + 23001.

It is an arithmetic number, because the mean of its divisors is an integer number (4746060).

Almost surely, 2^25221998 is an apocalyptic number.

25221998 is a deficient number, since it is larger than the sum of its proper divisors (12746482).

25221998 is a wasteful number, since it uses less digits than its factorization.

25221998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45162.

The product of its digits is 25920, while the sum is 38.

The square root of 25221998 is about 5022.1507344961. The cubic root of 25221998 is about 293.2647259773.

The spelling of 25221998 in words is "twenty-five million, two hundred twenty-one thousand, nine hundred ninety-eight".