1221120202112 has 64 divisors (see below), whose sum is σ = 2485037016000. Its totient is φ = 597430677504.

The previous prime is 1221120202063. The next prime is 1221120202117. The reversal of 1221120202112 is 2112020211221.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1221120202112² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221120202117) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28813514 + ... + 28855862.

It is an arithmetic number, because the mean of its divisors is an integer number (38828703375).

Almost surely, 2^{1221120202112} 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 1221120202112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1242518508000).

1221120202112 is an abundant number, since it is smaller than the sum of its proper divisors (1263916813888).

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

1221120202112 is an equidigital number, since it uses as much as digits as its factorization.

1221120202112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47203 (or 47191 counting only the distinct ones).

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

Adding to 1221120202112 its reverse (2112020211221), we get a palindrome (3333140413333).

The spelling of 1221120202112 in words is "one trillion, two hundred twenty-one billion, one hundred twenty million, two hundred two thousand, one hundred twelve".