1111221121100 has 72 divisors (see below), whose sum is σ = 2557402565760. Its totient is φ = 417652485120.

The previous prime is 1111221121099. The next prime is 1111221121163. The reversal of 1111221121100 is 11211221111.

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 23 ways as a sum of consecutive naturals, for example, 493466 + ... + 1570334.

It is an arithmetic number, because the mean of its divisors is an integer number (35519480080).

Almost surely, 2^{1111221121100} is an apocalyptic number.

1111221121100 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 1111221121100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1278701282880).

1111221121100 is an abundant number, since it is smaller than the sum of its proper divisors (1446181444660).

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

1111221121100 is a wasteful number, since it uses less digits than its factorization.

1111221121100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1077507 (or 1077500 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 1111221121100 its reverse (11211221111), we get a palindrome (1122432342211).

It can be divided in two parts, 1111221 and 121100, that added together give a palindrome (1232321).

The spelling of 1111221121100 in words is "one trillion, one hundred eleven billion, two hundred twenty-one million, one hundred twenty-one thousand, one hundred".