21222339 has 16 divisors (see below), whose sum is σ = 28802592. Its totient is φ = 13897728.

The previous prime is 21222293. The next prime is 21222343. The reversal of 21222339 is 93322212.

It is not a de Polignac number, because 21222339 - 2⁷ = 21222211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67647 + ... + 67959.

It is an arithmetic number, because the mean of its divisors is an integer number (1800162).

Almost surely, 2^21222339 is an apocalyptic number.

21222339 is a deficient number, since it is larger than the sum of its proper divisors (7580253).

21222339 is a wasteful number, since it uses less digits than its factorization.

21222339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646.

The product of its digits is 1296, while the sum is 24.

The square root of 21222339 is about 4606.7709949595. The cubic root of 21222339 is about 276.8626783103.

The spelling of 21222339 in words is "twenty-one million, two hundred twenty-two thousand, three hundred thirty-nine".