1221011000112 has 40 divisors (see below), whose sum is σ = 3320293072960. Its totient is φ = 385582420800.

The previous prime is 1221011000089. The next prime is 1221011000113. The reversal of 1221011000112 is 2110001101221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (1221011000113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669413014 + ... + 669414837.

It is an arithmetic number, because the mean of its divisors is an integer number (83007326824).

Almost surely, 2^{1221011000112} is an apocalyptic number.

1221011000112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221011000112 is an abundant number, since it is smaller than the sum of its proper divisors (2099282072848).

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

1221011000112 is a wasteful number, since it uses less digits than its factorization.

1221011000112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338827881 (or 1338827875 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1221011000112 its reverse (2110001101221), we get a palindrome (3331012101333).

The spelling of 1221011000112 in words is "one trillion, two hundred twenty-one billion, eleven million, one hundred twelve", and thus it is an aban number.