10121100111191 has 4 divisors (see below), whose sum is σ = 10447587211584. Its totient is φ = 9794613010800.

The previous prime is 10121100111169. The next prime is 10121100111211. The reversal of 10121100111191 is 19111100112101.

It is a happy number.

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 10121100111191 - 2²² = 10121095916887 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 (10121100111121) 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, 163243550150 + ... + 163243550211.

It is an arithmetic number, because the mean of its divisors is an integer number (2611896802896).

Almost surely, 2^{10121100111191} is an apocalyptic number.

10121100111191 is a deficient number, since it is larger than the sum of its proper divisors (326487100393).

10121100111191 is an equidigital number, since it uses as much as digits as its factorization.

10121100111191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326487100392.

The product of its (nonzero) digits is 18, while the sum is 20.

Adding to 10121100111191 its reverse (19111100112101), we get a palindrome (29232200223292).

The spelling of 10121100111191 in words is "ten trillion, one hundred twenty-one billion, one hundred million, one hundred eleven thousand, one hundred ninety-one".