1122221222100 has 432 divisors, whose sum is σ = 3953156940096. Its totient is φ = 263886336000.

The previous prime is 1122221222099. The next prime is 1122221222107. The reversal of 1122221222100 is 12221222211.

It is a happy number.

1122221222100 is a `hidden beast` number, since 1 + 122 + 221 + 222 + 100 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1122221222107) by changing a digit.

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 143 ways as a sum of consecutive naturals, for example, 123438555 + ... + 123447645.

Almost surely, 2^{1122221222100} is an apocalyptic number.

1122221222100 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 1122221222100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1976578470048).

1122221222100 is an abundant number, since it is smaller than the sum of its proper divisors (2830935717996).

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

1122221222100 is a wasteful number, since it uses less digits than its factorization.

1122221222100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9496 (or 9486 counting only the distinct ones).

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

Adding to 1122221222100 its reverse (12221222211), we get a palindrome (1134442444311).

The spelling of 1122221222100 in words is "one trillion, one hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred".