111221100100 has 36 divisors (see below), whose sum is σ = 263290679568. Its totient is φ = 40444036000.

The previous prime is 111221100083. The next prime is 111221100139. The reversal of 111221100100 is 1001122111.

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

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50553946 + ... + 50556145.

It is an arithmetic number, because the mean of its divisors is an integer number (7313629988).

Almost surely, 2^111221100100 is an apocalyptic number.

111221100100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111221100100 is an abundant number, since it is smaller than the sum of its proper divisors (152069579468).

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

111221100100 is a wasteful number, since it uses less digits than its factorization.

111221100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101110116 (or 101110109 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 111221100100 its reverse (1001122111), we get a palindrome (112222222211).

The spelling of 111221100100 in words is "one hundred eleven billion, two hundred twenty-one million, one hundred thousand, one hundred".