20999182811 has 2 divisors, whose sum is σ = 20999182812. Its totient is φ = 20999182810.

The previous prime is 20999182807. The next prime is 20999182891. The reversal of 20999182811 is 11828199902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20999182811 - 2² = 20999182807 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20999182811.

It is not a weakly prime, because it can be changed into another prime (20999182891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10499591405 + 10499591406.

It is an arithmetic number, because the mean of its divisors is an integer number (10499591406).

Almost surely, 2^20999182811 is an apocalyptic number.

20999182811 is a deficient number, since it is larger than the sum of its proper divisors (1).

20999182811 is an equidigital number, since it uses as much as digits as its factorization.

20999182811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 50.

The spelling of 20999182811 in words is "twenty billion, nine hundred ninety-nine million, one hundred eighty-two thousand, eight hundred eleven".