21874422 has 8 divisors (see below), whose sum is σ = 43748856. Its totient is φ = 7291472.

The previous prime is 21874421. The next prime is 21874451. The reversal of 21874422 is 22447812.

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

21874422 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21874422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21874421) 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, 1822863 + ... + 1822874.

It is an arithmetic number, because the mean of its divisors is an integer number (5468607).

Almost surely, 2^21874422 is an apocalyptic number.

21874422 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.

21874422 is a wasteful number, since it uses less digits than its factorization.

21874422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3645742.

The product of its digits is 7168, while the sum is 30.

The square root of 21874422 is about 4677.0099422601. The cubic root of 21874422 is about 279.6697722521.

The spelling of 21874422 in words is "twenty-one million, eight hundred seventy-four thousand, four hundred twenty-two".