213111112122 has 24 divisors (see below), whose sum is σ = 461749512276. Its totient is φ = 71035688256.

The previous prime is 213111112103. The next prime is 213111112127. The reversal of 213111112122 is 221211111312.

It is a happy number.

213111112122 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 163556345241 + 49554766881 = 404421^2 + 222609^2 .

It is a super-2 number, since 2×213111112122² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 = 213111112095 and 213111112104.

It is not an unprimeable number, because it can be changed into a prime (213111112127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1444108 + ... + 1584824.

Almost surely, 2^213111112122 is an apocalyptic number.

213111112122 is an abundant number, since it is smaller than the sum of its proper divisors (248638400154).

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

213111112122 is a wasteful number, since it uses less digits than its factorization.

213111112122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224862 (or 224859 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

Adding to 213111112122 its reverse (221211111312), we get a palindrome (434322223434).

The spelling of 213111112122 in words is "two hundred thirteen billion, one hundred eleven million, one hundred twelve thousand, one hundred twenty-two".