1221102211012 has 12 divisors (see below), whose sum is σ = 2137065375760. Its totient is φ = 610512103656.

The previous prime is 1221102210989. The next prime is 1221102211019. The reversal of 1221102211012 is 2101122011221.

It is not an unprimeable number, because it can be changed into a prime (1221102211019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9679962 + ... + 9805297.

Almost surely, 2^{1221102211012} is an apocalyptic number.

It is an amenable number.

1221102211012 is a deficient number, since it is larger than the sum of its proper divisors (915963164748).

1221102211012 is a wasteful number, since it uses less digits than its factorization.

1221102211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19500930 (or 19500928 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 1221102211012 its reverse (2101122011221), we get a palindrome (3322224222233).

The spelling of 1221102211012 in words is "one trillion, two hundred twenty-one billion, one hundred two million, two hundred eleven thousand, twelve".