111121002100 has 36 divisors (see below), whose sum is σ = 243266515884. Its totient is φ = 44055047680.

The previous prime is 111121002089. The next prime is 111121002101. The reversal of 111121002100 is 1200121111.

It can be written as a sum of positive squares in 6 ways, for example, as 28980295696 + 82140706404 = 170236^2 + 286602^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121002101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4905559 + ... + 4928158.

It is an arithmetic number, because the mean of its divisors is an integer number (6757403219).

Almost surely, 2^111121002100 is an apocalyptic number.

111121002100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111121002100 is an abundant number, since it is smaller than the sum of its proper divisors (132145513784).

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

111121002100 is a wasteful number, since it uses less digits than its factorization.

111121002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9833844 (or 9833837 counting only the distinct ones).

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

Adding to 111121002100 its reverse (1200121111), we get a palindrome (112321123211).

The spelling of 111121002100 in words is "one hundred eleven billion, one hundred twenty-one million, two thousand, one hundred".