20112001111191 has 16 divisors (see below), whose sum is σ = 29254747039488. Its totient is φ = 12188705232000.

The previous prime is 20112001111133. The next prime is 20112001111243. The reversal of 20112001111191 is 19111110021102.

It is a happy number.

It is not a de Polignac number, because 20112001111191 - 2⁷ = 20112001111063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112001101191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8600131 + ... + 10685796.

It is an arithmetic number, because the mean of its divisors is an integer number (1828421689968).

Almost surely, 2^{20112001111191} is an apocalyptic number.

20112001111191 is a deficient number, since it is larger than the sum of its proper divisors (9142745928297).

20112001111191 is a wasteful number, since it uses less digits than its factorization.

20112001111191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19317542.

The product of its (nonzero) digits is 36, while the sum is 21.

Adding to 20112001111191 its reverse (19111110021102), we get a palindrome (39223111132293).

The spelling of 20112001111191 in words is "twenty trillion, one hundred twelve billion, one million, one hundred eleven thousand, one hundred ninety-one".