25221894 has 8 divisors (see below), whose sum is σ = 50443800. Its totient is φ = 8407296.

The previous prime is 25221871. The next prime is 25221899. The reversal of 25221894 is 49812252.

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

25221894 is an admirable number.

It is a super-2 number, since 2×25221894² = 1272287873894472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2101819 + ... + 2101830.

It is an arithmetic number, because the mean of its divisors is an integer number (6305475).

Almost surely, 2^25221894 is an apocalyptic number.

25221894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25221894 is a wasteful number, since it uses less digits than its factorization.

25221894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4203654.

The product of its digits is 11520, while the sum is 33.

The square root of 25221894 is about 5022.1403803558. The cubic root of 25221894 is about 293.2643228956.

The spelling of 25221894 in words is "twenty-five million, two hundred twenty-one thousand, eight hundred ninety-four".