1211211111222 has 64 divisors (see below), whose sum is σ = 3115029657600. Its totient is φ = 341679798720.

The previous prime is 1211211111221. The next prime is 1211211111251. The reversal of 1211211111222 is 2221111121121.

It is a happy number.

1211211111222 is a `hidden beast` number, since 121 + 1 + 211 + 111 + 222 = 666.

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 = 1211211111195 and 1211211111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211211111221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20250279 + ... + 20310002.

It is an arithmetic number, because the mean of its divisors is an integer number (48672338400).

Almost surely, 2^{1211211111222} is an apocalyptic number.

1211211111222 is an abundant number, since it is smaller than the sum of its proper divisors (1903818546378).

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

1211211111222 is a wasteful number, since it uses less digits than its factorization.

1211211111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40560378 (or 40560372 counting only the distinct ones).

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

Adding to 1211211111222 its reverse (2221111121121), we get a palindrome (3432322232343).

The spelling of 1211211111222 in words is "one trillion, two hundred eleven billion, two hundred eleven million, one hundred eleven thousand, two hundred twenty-two".