1212120111222 has 48 divisors (see below), whose sum is σ = 2697366918480. Its totient is φ = 393101574336.

The previous prime is 1212120111217. The next prime is 1212120111227. The reversal of 1212120111222 is 2221110212121.

1212120111222 is a `hidden beast` number, since 1 + 212 + 120 + 111 + 222 = 666.

It is an interprime number because it is at equal distance from previous prime (1212120111217) and next prime (1212120111227).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1212120111195 and 1212120111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212120111227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26759229 + ... + 26804487.

It is an arithmetic number, because the mean of its divisors is an integer number (56195144135).

Almost surely, 2^{1212120111222} is an apocalyptic number.

1212120111222 is an abundant number, since it is smaller than the sum of its proper divisors (1485246807258).

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

1212120111222 is a wasteful number, since it uses less digits than its factorization.

1212120111222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85517 (or 85514 counting only the distinct ones).

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

Adding to 1212120111222 its reverse (2221110212121), we get a palindrome (3433230323343).

The spelling of 1212120111222 in words is "one trillion, two hundred twelve billion, one hundred twenty million, one hundred eleven thousand, two hundred twenty-two".