1211122222222 has 32 divisors (see below), whose sum is σ = 1991004447744. Its totient is φ = 547964481600.

The previous prime is 1211122222201. The next prime is 1211122222301. The reversal of 1211122222222 is 2222222211121.

It is a Harshad number since it is a multiple of its sum of digits (22).

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

1211122222222 is a modest number, since divided by 2222222 gives 121112 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1211122222193 and 1211122222202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25060722 + ... + 25109002.

It is an arithmetic number, because the mean of its divisors is an integer number (62218888992).

Almost surely, 2^{1211122222222} is an apocalyptic number.

1211122222222 is a deficient number, since it is larger than the sum of its proper divisors (779882225522).

1211122222222 is a wasteful number, since it uses less digits than its factorization.

1211122222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53544.

The product of its digits is 512, while the sum is 22.

Adding to 1211122222222 its reverse (2222222211121), we get a palindrome (3433344433343).

The spelling of 1211122222222 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-two".