1221000212012 has 12 divisors (see below), whose sum is σ = 2442000424080. Its totient is φ = 523285805136.

The previous prime is 1221000212009. The next prime is 1221000212021. The reversal of 1221000212012 is 2102120001221.

1221000212012 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (14).

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 3 ways as a sum of consecutive naturals, for example, 21803575187 + ... + 21803575242.

It is an arithmetic number, because the mean of its divisors is an integer number (203500035340).

Almost surely, 2^{1221000212012} is an apocalyptic number.

It is an amenable number.

1221000212012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1221000212012 is a wasteful number, since it uses less digits than its factorization.

1221000212012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43607150440 (or 43607150438 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221000212012 its reverse (2102120001221), we get a palindrome (3323120213233).

The spelling of 1221000212012 in words is "one trillion, two hundred twenty-one billion, two hundred twelve thousand, twelve".