1222200100 has 36 divisors (see below), whose sum is σ = 2893283568. Its totient is φ = 444436000.

The previous prime is 1222200071. The next prime is 1222200103. The reversal of 1222200100 is 10022221.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (1222200103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 554446 + ... + 556645.

It is an arithmetic number, because the mean of its divisors is an integer number (80368988).

Almost surely, 2^1222200100 is an apocalyptic number.

1222200100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222200100 is an abundant number, since it is smaller than the sum of its proper divisors (1671083468).

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

1222200100 is a wasteful number, since it uses less digits than its factorization.

1222200100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1111116 (or 1111109 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1222200100 is about 34959.9785469042. The cubic root of 1222200100 is about 1069.1716592518.

Adding to 1222200100 its reverse (10022221), we get a palindrome (1232222321).

The spelling of 1222200100 in words is "one billion, two hundred twenty-two million, two hundred thousand, one hundred".