21311122 has 32 divisors (see below), whose sum is σ = 38851200. Its totient is φ = 8563968.

The previous prime is 21311117. The next prime is 21311123. The reversal of 21311122 is 22111312.

It is not an unprimeable number, because it can be changed into a prime (21311123) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 29704 + ... + 30412.

It is an arithmetic number, because the mean of its divisors is an integer number (1214100).

Almost surely, 2^21311122 is an apocalyptic number.

21311122 is a deficient number, since it is larger than the sum of its proper divisors (17540078).

21311122 is a wasteful number, since it uses less digits than its factorization.

21311122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850.

The product of its digits is 24, while the sum is 13.

The square root of 21311122 is about 4616.3970799748. The cubic root of 21311122 is about 277.2482233262.

Adding to 21311122 its reverse (22111312), we get a palindrome (43422434).

The spelling of 21311122 in words is "twenty-one million, three hundred eleven thousand, one hundred twenty-two".