21126322 has 16 divisors (see below), whose sum is σ = 36654912. Its totient is φ = 8944560.

The previous prime is 21126317. The next prime is 21126337. The reversal of 21126322 is 22362112.

It is a self number, because there is not a number n which added to its sum of digits gives 21126322.

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 7 ways as a sum of consecutive naturals, for example, 7929 + ... + 10252.

It is an arithmetic number, because the mean of its divisors is an integer number (2290932).

Almost surely, 2^21126322 is an apocalyptic number.

21126322 is a deficient number, since it is larger than the sum of its proper divisors (15528590).

21126322 is a wasteful number, since it uses less digits than its factorization.

21126322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18273.

The product of its digits is 288, while the sum is 19.

The square root of 21126322 is about 4596.3378901034. The cubic root of 21126322 is about 276.4445070649. Note that the first 3 decimals are identical.

Adding to 21126322 its reverse (22362112), we get a palindrome (43488434).

The spelling of 21126322 in words is "twenty-one million, one hundred twenty-six thousand, three hundred twenty-two".