121111200100 has 144 divisors (see below), whose sum is σ = 288808515072. Its totient is φ = 43718400000.

The previous prime is 121111200071. The next prime is 121111200101. The reversal of 121111200100 is 1002111121.

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

It is not an unprimeable number, because it can be changed into a prime (121111200101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 122210605 + ... + 122211595.

It is an arithmetic number, because the mean of its divisors is an integer number (2005614688).

Almost surely, 2^121111200100 is an apocalyptic number.

121111200100 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 121111200100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144404257536).

121111200100 is an abundant number, since it is smaller than the sum of its proper divisors (167697314972).

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

121111200100 is a wasteful number, since it uses less digits than its factorization.

121111200100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718 (or 1711 counting only the distinct ones).

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

Adding to 121111200100 its reverse (1002111121), we get a palindrome (122113311221).

The spelling of 121111200100 in words is "one hundred twenty-one billion, one hundred eleven million, two hundred thousand, one hundred".