21222322 has 16 divisors (see below), whose sum is σ = 35074944. Its totient is φ = 9550000.

The previous prime is 21222293. The next prime is 21222343. The reversal of 21222322 is 22322212.

It is a junction number, because it is equal to n+sod(n) for n = 21222296 and 21222305.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2554 + ... + 6997.

It is an arithmetic number, because the mean of its divisors is an integer number (2192184).

Almost surely, 2^21222322 is an apocalyptic number.

21222322 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21222322 is a deficient number, since it is larger than the sum of its proper divisors (13852622).

21222322 is a wasteful number, since it uses less digits than its factorization.

21222322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9665.

The product of its digits is 192, while the sum is 16.

The square root of 21222322 is about 4606.7691498489. The cubic root of 21222322 is about 276.8626043840.

Adding to 21222322 its reverse (22322212), we get a palindrome (43544534).

It can be divided in two parts, 2122 and 2322, that added together give a palindrome (4444).

The spelling of 21222322 in words is "twenty-one million, two hundred twenty-two thousand, three hundred twenty-two".