20012202019991 has 2 divisors, whose sum is σ = 20012202019992. Its totient is φ = 20012202019990.

The previous prime is 20012202019981. The next prime is 20012202020033. The reversal of 20012202019991 is 19991020221002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20012202019991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012202019961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006101009995 + 10006101009996.

It is an arithmetic number, because the mean of its divisors is an integer number (10006101009996).

Almost surely, 2^{20012202019991} is an apocalyptic number.

20012202019991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012202019991 is an equidigital number, since it uses as much as digits as its factorization.

20012202019991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 38.

The spelling of 20012202019991 in words is "twenty trillion, twelve billion, two hundred two million, nineteen thousand, nine hundred ninety-one".