21108322 has 16 divisors (see below), whose sum is σ = 33613272. Its totient is φ = 9907200.

The previous prime is 21108301. The next prime is 21108323. The reversal of 21108322 is 22380112.

It can be written as a sum of positive squares in 4 ways, for example, as 19900521 + 1207801 = 4461^2 + 1099^2 .

It is a super-2 number, since 2×21108322² = 891122515311368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21108322.

It is not an unprimeable number, because it can be changed into a prime (21108323) 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, 19918 + ... + 20950.

Almost surely, 2^21108322 is an apocalyptic number.

21108322 is a deficient number, since it is larger than the sum of its proper divisors (12504950).

21108322 is a wasteful number, since it uses less digits than its factorization.

21108322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21108322 is about 4594.3793922575. The cubic root of 21108322 is about 276.3659728867.

Adding to 21108322 its reverse (22380112), we get a palindrome (43488434).

The spelling of 21108322 in words is "twenty-one million, one hundred eight thousand, three hundred twenty-two".