1222112100 has 216 divisors, whose sum is σ = 3931560864. Its totient is φ = 292864000.

The previous prime is 1222112069. The next prime is 1222112117. The reversal of 1222112100 is 12112221.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4755172 + ... + 4755428.

Almost surely, 2^1222112100 is an apocalyptic number.

1222112100 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 1222112100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1965780432).

1222112100 is an abundant number, since it is smaller than the sum of its proper divisors (2709448764).

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

1222112100 is a wasteful number, since it uses less digits than its factorization.

1222112100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427 (or 409 counting only the distinct ones).

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

The square root of 1222112100 is about 34958.7199422404. The cubic root of 1222112100 is about 1069.1459980516.

Adding to 1222112100 its reverse (12112221), we get a palindrome (1234224321).

The spelling of 1222112100 in words is "one billion, two hundred twenty-two million, one hundred twelve thousand, one hundred".