20113211019991 has 8 divisors (see below), whose sum is σ = 20494368388080. Its totient is φ = 19732115237952.

The previous prime is 20113211019971. The next prime is 20113211020033. The reversal of 20113211019991 is 19991011231102.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20113211019991 - 2²¹ = 20113208922839 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 (20113211019931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14736885 + ... + 16043758.

It is an arithmetic number, because the mean of its divisors is an integer number (2561796048510).

Almost surely, 2^{20113211019991} is an apocalyptic number.

20113211019991 is a deficient number, since it is larger than the sum of its proper divisors (381157368089).

20113211019991 is a wasteful number, since it uses less digits than its factorization.

20113211019991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30793025.

The product of its (nonzero) digits is 8748, while the sum is 40.

The spelling of 20113211019991 in words is "twenty trillion, one hundred thirteen billion, two hundred eleven million, nineteen thousand, nine hundred ninety-one".