1211122222002 has 144 divisors (see below), whose sum is σ = 3338117502720. Its totient is φ = 310594901760.

The previous prime is 1211122221983. The next prime is 1211122222019. The reversal of 1211122222002 is 2002222211121.

It is a happy number.

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

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 701658 + ... + 1707210.

Almost surely, 2^{1211122222002} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211122222002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1669058751360).

1211122222002 is an abundant number, since it is smaller than the sum of its proper divisors (2126995280718).

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

1211122222002 is a wasteful number, since it uses less digits than its factorization.

1211122222002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005669 (or 1005655 counting only the distinct ones).

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

Adding to 1211122222002 its reverse (2002222211121), we get a palindrome (3213344433123).

The spelling of 1211122222002 in words is "one trillion, two hundred eleven billion, one hundred twenty-two million, two hundred twenty-two thousand, two".