20012011011191 has 4 divisors (see below), whose sum is σ = 20012199680400. Its totient is φ = 20011822341984.

The previous prime is 20012011011143. The next prime is 20012011011277. The reversal of 20012011011191 is 19111011021002.

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 20012011011191 - 2³⁴ = 19994831142007 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 (20012017011191) 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, 94175411 + ... + 94387668.

It is an arithmetic number, because the mean of its divisors is an integer number (5003049920100).

Almost surely, 2^{20012011011191} is an apocalyptic number.

20012011011191 is a deficient number, since it is larger than the sum of its proper divisors (188669209).

20012011011191 is a wasteful number, since it uses less digits than its factorization.

20012011011191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188669208.

The product of its (nonzero) digits is 36, while the sum is 20.

Adding to 20012011011191 its reverse (19111011021002), we get a palindrome (39123022032193).

The spelling of 20012011011191 in words is "twenty trillion, twelve billion, eleven million, eleven thousand, one hundred ninety-one".