21322244 has 12 divisors (see below), whose sum is σ = 37355724. Its totient is φ = 10649184.

The previous prime is 21322241. The next prime is 21322277. The reversal of 21322244 is 44222312.

It can be written as a sum of positive squares in 2 ways, for example, as 15132100 + 6190144 = 3890^2 + 2488^2 .

It is not an unprimeable number, because it can be changed into a prime (21322241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1934 + ... + 6810.

It is an arithmetic number, because the mean of its divisors is an integer number (3112977).

Almost surely, 2^21322244 is an apocalyptic number.

It is an amenable number.

21322244 is a deficient number, since it is larger than the sum of its proper divisors (16033480).

21322244 is a wasteful number, since it uses less digits than its factorization.

21322244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5974 (or 5972 counting only the distinct ones).

The product of its digits is 768, while the sum is 20.

The square root of 21322244 is about 4617.6015419263. The cubic root of 21322244 is about 277.2964456969.

Adding to 21322244 its reverse (44222312), we get a palindrome (65544556).

The spelling of 21322244 in words is "twenty-one million, three hundred twenty-two thousand, two hundred forty-four".