21022338 has 16 divisors (see below), whose sum is σ = 42157440. Its totient is φ = 6988656.

The previous prime is 21022279. The next prime is 21022357. The reversal of 21022338 is 83322012.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2170 + ... + 6837.

It is an arithmetic number, because the mean of its divisors is an integer number (2634840).

Almost surely, 2^21022338 is an apocalyptic number.

21022338 is an abundant number, since it is smaller than the sum of its proper divisors (21135102).

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

21022338 is a wasteful number, since it uses less digits than its factorization.

21022338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9401.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21022338 is about 4585.0123227752. The cubic root of 21022338 is about 275.9902065418.

The spelling of 21022338 in words is "twenty-one million, twenty-two thousand, three hundred thirty-eight".