1221222010112 has 72 divisors (see below), whose sum is σ = 2625641764200. Its totient is φ = 563543285760.

The previous prime is 1221222010097. The next prime is 1221222010147. The reversal of 1221222010112 is 2110102221221.

It can be written as a sum of positive squares in 4 ways, for example, as 63996856576 + 1157225153536 = 252976^2 + 1075744^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21340514 + ... + 21397662.

It is an arithmetic number, because the mean of its divisors is an integer number (36467246725).

Almost surely, 2^{1221222010112} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221222010112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1312820882100).

1221222010112 is an abundant number, since it is smaller than the sum of its proper divisors (1404419754088).

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

1221222010112 is an equidigital number, since it uses as much as digits as its factorization.

1221222010112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63599 (or 63585 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221222010112 its reverse (2110102221221), we get a palindrome (3331324231333).

The spelling of 1221222010112 in words is "one trillion, two hundred twenty-one billion, two hundred twenty-two million, ten thousand, one hundred twelve".