1211111112222 has 24 divisors (see below), whose sum is σ = 2862626265720. Its totient is φ = 367003367280.

The previous prime is 1211111112209. The next prime is 1211111112257. The reversal of 1211111112222 is 2222111111121.

It is a happy number.

It is a super-2 number, since 2×1211111112222² (a number of 25 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 = 1211111112195 and 1211111112204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3058361197 + ... + 3058361592.

It is an arithmetic number, because the mean of its divisors is an integer number (119276094405).

Almost surely, 2^{1211111112222} is an apocalyptic number.

1211111112222 is an abundant number, since it is smaller than the sum of its proper divisors (1651515153498).

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

1211111112222 is a wasteful number, since it uses less digits than its factorization.

1211111112222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6116722808 (or 6116722805 counting only the distinct ones).

The product of its digits is 32, while the sum is 18.

Adding to 1211111112222 its reverse (2222111111121), we get a palindrome (3433222223343).

The spelling of 1211111112222 in words is "one trillion, two hundred eleven billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty-two".