1222222011100 has 72 divisors (see below), whose sum is σ = 2714310023040. Its totient is φ = 477447391680.

The previous prime is 1222222011083. The next prime is 1222222011211. The reversal of 1222222011100 is 11102222221.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35324409 + ... + 35358991.

It is an arithmetic number, because the mean of its divisors is an integer number (37698750320).

Almost surely, 2^{1222222011100} is an apocalyptic number.

1222222011100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222222011100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1357155011520).

1222222011100 is an abundant number, since it is smaller than the sum of its proper divisors (1492088011940).

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

1222222011100 is a wasteful number, since it uses less digits than its factorization.

1222222011100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42859 (or 42852 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1222222011100 its reverse (11102222221), we get a palindrome (1233324233321).

The spelling of 1222222011100 in words is "one trillion, two hundred twenty-two billion, two hundred twenty-two million, eleven thousand, one hundred".