100120111121 has 4 divisors (see below), whose sum is σ = 100299860532. Its totient is φ = 99940361712.

The previous prime is 100120111103. The next prime is 100120111213. The reversal of 100120111121 is 121111021001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9856518400 + 90263592721 = 99280^2 + 300439^2 .

It is a cyclic number.

It is not a de Polignac number, because 100120111121 - 2³⁰ = 99046369297 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (100120117121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89873870 + ... + 89874983.

It is an arithmetic number, because the mean of its divisors is an integer number (25074965133).

Almost surely, 2^100120111121 is an apocalyptic number.

It is an amenable number.

100120111121 is a deficient number, since it is larger than the sum of its proper divisors (179749411).

100120111121 is an equidigital number, since it uses as much as digits as its factorization.

100120111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179749410.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 100120111121 its reverse (121111021001), we get a palindrome (221231132122).

The spelling of 100120111121 in words is "one hundred billion, one hundred twenty million, one hundred eleven thousand, one hundred twenty-one".