21113312122 has 16 divisors (see below), whose sum is σ = 36207093312. Its totient is φ = 9045351360.

The previous prime is 21113312057. The next prime is 21113312179. The reversal of 21113312122 is 22121331112.

It is a self number, because there is not a number n which added to its sum of digits gives 21113312122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226504 + ... + 305827.

It is an arithmetic number, because the mean of its divisors is an integer number (2262943332).

Almost surely, 2^21113312122 is an apocalyptic number.

21113312122 is a deficient number, since it is larger than the sum of its proper divisors (15093781190).

21113312122 is a wasteful number, since it uses less digits than its factorization.

21113312122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535173.

The product of its digits is 144, while the sum is 19.

Adding to 21113312122 its reverse (22121331112), we get a palindrome (43234643234).

The spelling of 21113312122 in words is "twenty-one billion, one hundred thirteen million, three hundred twelve thousand, one hundred twenty-two".