121111221222 has 20 divisors (see below), whose sum is σ = 271378847916. Its totient is φ = 40370407020.

The previous prime is 121111221221. The next prime is 121111221229. The reversal of 121111221222 is 222122111121.

121111221222 is a `hidden beast` number, since 1 + 211 + 11 + 221 + 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 = 121111221195 and 121111221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111221221) 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 9 ways as a sum of consecutive naturals, for example, 373799904 + ... + 373800227.

Almost surely, 2^121111221222 is an apocalyptic number.

121111221222 is an abundant number, since it is smaller than the sum of its proper divisors (150267626694).

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

121111221222 is an equidigital number, since it uses as much as digits as its factorization.

121111221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747600145 (or 747600136 counting only the distinct ones).

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

Adding to 121111221222 its reverse (222122111121), we get a palindrome (343233332343).

The spelling of 121111221222 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, two hundred twenty-two".