21894422 has 16 divisors (see below), whose sum is σ = 37713600. Its totient is φ = 9428040.

The previous prime is 21894421. The next prime is 21894443. The reversal of 21894422 is 22449812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21894421) 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, 25772 + ... + 26607.

It is an arithmetic number, because the mean of its divisors is an integer number (2357100).

Almost surely, 2^21894422 is an apocalyptic number.

21894422 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21894422 is a deficient number, since it is larger than the sum of its proper divisors (15819178).

21894422 is a wasteful number, since it uses less digits than its factorization.

21894422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52411.

The product of its digits is 9216, while the sum is 32.

The square root of 21894422 is about 4679.1475719409. The cubic root of 21894422 is about 279.7549812329.

The spelling of 21894422 in words is "twenty-one million, eight hundred ninety-four thousand, four hundred twenty-two".