21868422 has 16 divisors (see below), whose sum is σ = 43798080. Its totient is φ = 7279272.

The previous prime is 21868421. The next prime is 21868433. The reversal of 21868422 is 22486812.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3033 + ... + 7275.

It is an arithmetic number, because the mean of its divisors is an integer number (2737380).

Almost surely, 2^21868422 is an apocalyptic number.

21868422 is an abundant number, since it is smaller than the sum of its proper divisors (21929658).

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

21868422 is a wasteful number, since it uses less digits than its factorization.

21868422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5107.

The product of its digits is 12288, while the sum is 33.

The square root of 21868422 is about 4676.3684628139. The cubic root of 21868422 is about 279.6441994305.

The spelling of 21868422 in words is "twenty-one million, eight hundred sixty-eight thousand, four hundred twenty-two".