21113113122 has 12 divisors (see below), whose sum is σ = 45745078470. Its totient is φ = 7037704368.

The previous prime is 21113113121. The next prime is 21113113141. The reversal of 21113113122 is 22131131112.

It can be written as a sum of positive squares in only one way, i.e., 16988776281 + 4124336841 = 130341^2 + 64221^2 .

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 1172950729 = 21113113122 / (2 + 1 + 1 + 1 + 3 + 1 + 1 + 3 + 1 + 2 + 2).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21113113095 and 21113113104.

It is not an unprimeable number, because it can be changed into a prime (21113113121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586475347 + ... + 586475382.

Almost surely, 2^21113113122 is an apocalyptic number.

21113113122 is an abundant number, since it is smaller than the sum of its proper divisors (24631965348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21113113122 is a wasteful number, since it uses less digits than its factorization.

21113113122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172950737 (or 1172950734 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 21113113122 its reverse (22131131112), we get a palindrome (43244244234).

The spelling of 21113113122 in words is "twenty-one billion, one hundred thirteen million, one hundred thirteen thousand, one hundred twenty-two".