19999668642211 has 2 divisors, whose sum is σ = 19999668642212. Its totient is φ = 19999668642210.

The previous prime is 19999668642133. The next prime is 19999668642271. The reversal of 19999668642211 is 11224686699991.

It is a strong prime.

It is an emirp because it is prime and its reverse (11224686699991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19999668642211 - 2²¹ = 19999666545059 is a prime.

It is not a weakly prime, because it can be changed into another prime (19999668642271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9999834321105 + 9999834321106.

It is an arithmetic number, because the mean of its divisors is an integer number (9999834321106).

Almost surely, 2^{19999668642211} is an apocalyptic number.

19999668642211 is a deficient number, since it is larger than the sum of its proper divisors (1).

19999668642211 is an equidigital number, since it uses as much as digits as its factorization.

19999668642211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181398528, while the sum is 73.

The spelling of 19999668642211 in words is "nineteen trillion, nine hundred ninety-nine billion, six hundred sixty-eight million, six hundred forty-two thousand, two hundred eleven".