1200001011222 has 128 divisors (see below), whose sum is σ = 2639040768000. Its totient is φ = 361544062464.

The previous prime is 1200001011191. The next prime is 1200001011229. The reversal of 1200001011222 is 2221101000021.

It is a junction number, because it is equal to n+sod(n) for n = 1200001011198 and 1200001011207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200001011229) by changing a digit.

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 63 ways as a sum of consecutive naturals, for example, 615699904 + ... + 615701852.

It is an arithmetic number, because the mean of its divisors is an integer number (20617506000).

Almost surely, 2^{1200001011222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1200001011222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1319520384000).

1200001011222 is an abundant number, since it is smaller than the sum of its proper divisors (1439039756778).

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

1200001011222 is a wasteful number, since it uses less digits than its factorization.

1200001011222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2822.

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

Adding to 1200001011222 its reverse (2221101000021), we get a palindrome (3421102011243).

The spelling of 1200001011222 in words is "one trillion, two hundred billion, one million, eleven thousand, two hundred twenty-two".