100121012191 has 4 divisors (see below), whose sum is σ = 100539928800. Its totient is φ = 99702095584.

The previous prime is 100121012143. The next prime is 100121012203. The reversal of 100121012191 is 191210121001.

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

It is a cyclic number.

It is not a de Polignac number, because 100121012191 - 2¹⁹ = 100120487903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100121012111) 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, 209457946 + ... + 209458423.

It is an arithmetic number, because the mean of its divisors is an integer number (25134982200).

Almost surely, 2^100121012191 is an apocalyptic number.

100121012191 is a deficient number, since it is larger than the sum of its proper divisors (418916609).

100121012191 is an equidigital number, since it uses as much as digits as its factorization.

100121012191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418916608.

The product of its (nonzero) digits is 36, while the sum is 19.

Adding to 100121012191 its reverse (191210121001), we get a palindrome (291331133192).

The spelling of 100121012191 in words is "one hundred billion, one hundred twenty-one million, twelve thousand, one hundred ninety-one".