1121221222002 has 128 divisors (see below), whose sum is σ = 2857620902400. Its totient is φ = 319217614848.

The previous prime is 1121221222001. The next prime is 1121221222003. The reversal of 1121221222002 is 2002221221211.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1121221222001) and next prime (1121221222003).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1121221222001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 129332524 + ... + 129341192.

It is an arithmetic number, because the mean of its divisors is an integer number (22325163300).

Almost surely, 2^{1121221222002} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121221222002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1428810451200).

1121221222002 is an abundant number, since it is smaller than the sum of its proper divisors (1736399680398).

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

1121221222002 is a wasteful number, since it uses less digits than its factorization.

1121221222002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9857 (or 9851 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1121221222002 its reverse (2002221221211), we get a palindrome (3123442443213).

The spelling of 1121221222002 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, two".