1121220100100 has 72 divisors (see below), whose sum is σ = 2454664615368. Its totient is φ = 444517632000.

The previous prime is 1121220100087. The next prime is 1121220100127. The reversal of 1121220100100 is 10010221211.

It can be written as a sum of positive squares in 12 ways, for example, as 8482041604 + 1112738058496 = 92098^2 + 1054864^2 .

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 6206654 + ... + 6384746.

Almost surely, 2^{1121220100100} is an apocalyptic number.

1121220100100 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 1121220100100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1227332307684).

1121220100100 is an abundant number, since it is smaller than the sum of its proper divisors (1333444515268).

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

1121220100100 is a wasteful number, since it uses less digits than its factorization.

1121220100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178665 (or 178658 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1121220100100 its reverse (10010221211), we get a palindrome (1131230321311).

The spelling of 1121220100100 in words is "one trillion, one hundred twenty-one billion, two hundred twenty million, one hundred thousand, one hundred".