21222338 has 8 divisors (see below), whose sum is σ = 32610060. Its totient is φ = 10352320.

The previous prime is 21222293. The next prime is 21222343. The reversal of 21222338 is 83322212.

It can be written as a sum of positive squares in 2 ways, for example, as 17032129 + 4190209 = 4127^2 + 2047^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129323 + ... + 129486.

Almost surely, 2^21222338 is an apocalyptic number.

21222338 is a deficient number, since it is larger than the sum of its proper divisors (11387722).

21222338 is a wasteful number, since it uses less digits than its factorization.

21222338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258852.

The product of its digits is 1152, while the sum is 23.

The square root of 21222338 is about 4606.7708864236. The cubic root of 21222338 is about 276.8626739617.

The spelling of 21222338 in words is "twenty-one million, two hundred twenty-two thousand, three hundred thirty-eight".