21311112122 has 16 divisors (see below), whose sum is σ = 32339583720. Its totient is φ = 10531352832.

The previous prime is 21311112113. The next prime is 21311112157. The reversal of 21311112122 is 22121111312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 16425241921 + 4885870201 = 128161^2 + 69899^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21311112122.

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, 415988 + ... + 464400.

Almost surely, 2^21311112122 is an apocalyptic number.

21311112122 is a deficient number, since it is larger than the sum of its proper divisors (11028471598).

21311112122 is a wasteful number, since it uses less digits than its factorization.

21311112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50977.

The product of its digits is 48, while the sum is 17.

Adding to 21311112122 its reverse (22121111312), we get a palindrome (43432223434).

The spelling of 21311112122 in words is "twenty-one billion, three hundred eleven million, one hundred twelve thousand, one hundred twenty-two".