20011112119991 has 2 divisors, whose sum is σ = 20011112119992. Its totient is φ = 20011112119990.

The previous prime is 20011112119969. The next prime is 20011112119993. The reversal of 20011112119991 is 19991121111002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20011112119991 - 2¹⁰ = 20011112118967 is a prime.

Together with 20011112119993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011112119993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005556059995 + 10005556059996.

It is an arithmetic number, because the mean of its divisors is an integer number (10005556059996).

Almost surely, 2^{20011112119991} is an apocalyptic number.

20011112119991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011112119991 is an equidigital number, since it uses as much as digits as its factorization.

20011112119991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2916, while the sum is 38.

The spelling of 20011112119991 in words is "twenty trillion, eleven billion, one hundred twelve million, one hundred nineteen thousand, nine hundred ninety-one".