1211222111012 has 24 divisors (see below), whose sum is σ = 2134748536704. Its totient is φ = 601299777312.

The previous prime is 1211222110997. The next prime is 1211222111017. The reversal of 1211222111012 is 2101112221121.

It is not an unprimeable number, because it can be changed into a prime (1211222111017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106643 + ... + 1560069.

It is an arithmetic number, because the mean of its divisors is an integer number (88947855696).

Almost surely, 2^{1211222111012} is an apocalyptic number.

It is an amenable number.

1211222111012 is a deficient number, since it is larger than the sum of its proper divisors (923526425692).

1211222111012 is a wasteful number, since it uses less digits than its factorization.

1211222111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1454915 (or 1454913 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1211222111012 its reverse (2101112221121), we get a palindrome (3312334332133).

The spelling of 1211222111012 in words is "one trillion, two hundred eleven billion, two hundred twenty-two million, one hundred eleven thousand, twelve".