20011111199197 has 2 divisors, whose sum is σ = 20011111199198. Its totient is φ = 20011111199196.

The previous prime is 20011111199159. The next prime is 20011111199201. The reversal of 20011111199197 is 79199111111002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16240811340121 + 3770299859076 = 4029989^2 + 1941726^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011111199197 - 2¹¹ = 20011111197149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011111199117) 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 as a sum of consecutive naturals, namely, 10005555599598 + 10005555599599.

It is an arithmetic number, because the mean of its divisors is an integer number (10005555599599).

Almost surely, 2^{20011111199197} is an apocalyptic number.

It is an amenable number.

20011111199197 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011111199197 is an equidigital number, since it uses as much as digits as its factorization.

20011111199197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10206, while the sum is 43.

The spelling of 20011111199197 in words is "twenty trillion, eleven billion, one hundred eleven million, one hundred ninety-nine thousand, one hundred ninety-seven".