21894258 has 16 divisors (see below), whose sum is σ = 44241120. Its totient is φ = 7222656.

The previous prime is 21894253. The next prime is 21894259. The reversal of 21894258 is 85249812.

It is not an unprimeable number, because it can be changed into a prime (21894253) by changing a digit.

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, 18228 + ... + 19391.

It is an arithmetic number, because the mean of its divisors is an integer number (2765070).

Almost surely, 2^21894258 is an apocalyptic number.

21894258 is an abundant number, since it is smaller than the sum of its proper divisors (22346862).

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

21894258 is a wasteful number, since it uses less digits than its factorization.

21894258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37721.

The product of its digits is 46080, while the sum is 39.

The square root of 21894258 is about 4679.1300473485. The cubic root of 21894258 is about 279.7542827303.

The spelling of 21894258 in words is "twenty-one million, eight hundred ninety-four thousand, two hundred fifty-eight".