1221212120112 has 60 divisors (see below), whose sum is σ = 3510068034720. Its totient is φ = 396068793984.

The previous prime is 1221212120099. The next prime is 1221212120137. The reversal of 1221212120112 is 2110212121221.

1221212120112 is a `hidden beast` number, since 1 + 221 + 212 + 120 + 112 = 666.

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

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 114597912 + ... + 114608567.

It is an arithmetic number, because the mean of its divisors is an integer number (58501133912).

Almost surely, 2^{1221212120112} is an apocalyptic number.

1221212120112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221212120112 is an abundant number, since it is smaller than the sum of its proper divisors (2288855914608).

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

1221212120112 is a wasteful number, since it uses less digits than its factorization.

1221212120112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229206530 (or 229206521 counting only the distinct ones).

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

Adding to 1221212120112 its reverse (2110212121221), we get a palindrome (3331424241333).

The spelling of 1221212120112 in words is "one trillion, two hundred twenty-one billion, two hundred twelve million, one hundred twenty thousand, one hundred twelve".