211111222122 has 24 divisors (see below), whose sum is σ = 469770018276. Its totient is φ = 68468504256.

The previous prime is 211111222117. The next prime is 211111222123. The reversal of 211111222122 is 221222111112.

211111222122 is a `hidden beast` number, since 211 + 111 + 222 + 122 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 205880895081 + 5230327041 = 453741^2 + 72321^2 .

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 = 211111222095 and 211111222104.

It is not an unprimeable number, because it can be changed into a prime (211111222123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 158491243 + ... + 158492574.

Almost surely, 2^211111222122 is an apocalyptic number.

211111222122 is an abundant number, since it is smaller than the sum of its proper divisors (258658796154).

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

211111222122 is a wasteful number, since it uses less digits than its factorization.

211111222122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316983862 (or 316983859 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

Adding to 211111222122 its reverse (221222111112), we get a palindrome (432333333234).

The spelling of 211111222122 in words is "two hundred eleven billion, one hundred eleven million, two hundred twenty-two thousand, one hundred twenty-two".