1221200112 has 80 divisors (see below), whose sum is σ = 3552629760. Its totient is φ = 358118400.

The previous prime is 1221200093. The next prime is 1221200119. The reversal of 1221200112 is 2110021221.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221200119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20937 + ... + 53672.

It is an arithmetic number, because the mean of its divisors is an integer number (44407872).

Almost surely, 2^1221200112 is an apocalyptic number.

1221200112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221200112 is an abundant number, since it is smaller than the sum of its proper divisors (2331429648).

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

1221200112 is a wasteful number, since it uses less digits than its factorization.

1221200112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74662 (or 74656 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1221200112 is about 34945.6737236528. The cubic root of 1221200112 is about 1068.8799856400.

Adding to 1221200112 its reverse (2110021221), we get a palindrome (3331221333).

The spelling of 1221200112 in words is "one billion, two hundred twenty-one million, two hundred thousand, one hundred twelve".