21112133122 has 4 divisors (see below), whose sum is σ = 31668199686. Its totient is φ = 10556066560.

The previous prime is 21112133093. The next prime is 21112133137. The reversal of 21112133122 is 22133121112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15903479881 + 5208653241 = 126109^2 + 72171^2 .

It is a super-2 number, since 2×21112133122² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21112133122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5278033279 + ... + 5278033282.

Almost surely, 2^21112133122 is an apocalyptic number.

21112133122 is a deficient number, since it is larger than the sum of its proper divisors (10556066564).

21112133122 is a wasteful number, since it uses less digits than its factorization.

21112133122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10556066563.

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

Adding to 21112133122 its reverse (22133121112), we get a palindrome (43245254234).

The spelling of 21112133122 in words is "twenty-one billion, one hundred twelve million, one hundred thirty-three thousand, one hundred twenty-two".