21243322 has 8 divisors (see below), whose sum is σ = 32147316. Its totient is φ = 10527552.

The previous prime is 21243307. The next prime is 21243331. The reversal of 21243322 is 22334212.

It can be written as a sum of positive squares in 2 ways, for example, as 21242881 + 441 = 4609^2 + 21^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21243322.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46773 + ... + 47224.

Almost surely, 2^21243322 is an apocalyptic number.

21243322 is a deficient number, since it is larger than the sum of its proper divisors (10903994).

21243322 is a wasteful number, since it uses less digits than its factorization.

21243322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94112.

The product of its digits is 576, while the sum is 19.

The square root of 21243322 is about 4609.0478409320. The cubic root of 21243322 is about 276.9538950230.

Adding to 21243322 its reverse (22334212), we get a palindrome (43577534).

It can be divided in two parts, 212 and 43322, that added together give a palindrome (43534).

The spelling of 21243322 in words is "twenty-one million, two hundred forty-three thousand, three hundred twenty-two".