211111219973 has 2 divisors, whose sum is σ = 211111219974. Its totient is φ = 211111219972.

The previous prime is 211111219961. The next prime is 211111219981. The reversal of 211111219973 is 379912111112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187331421124 + 23779798849 = 432818^2 + 154207^2 .

It is a cyclic number.

It is not a de Polignac number, because 211111219973 - 2²⁰ = 211110171397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211111219993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105555609986 + 105555609987.

It is an arithmetic number, because the mean of its divisors is an integer number (105555609987).

Almost surely, 2^211111219973 is an apocalyptic number.

It is an amenable number.

211111219973 is a deficient number, since it is larger than the sum of its proper divisors (1).

211111219973 is an equidigital number, since it uses as much as digits as its factorization.

211111219973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6804, while the sum is 38.

The spelling of 211111219973 in words is "two hundred eleven billion, one hundred eleven million, two hundred nineteen thousand, nine hundred seventy-three".