211211111993737 has 2 divisors, whose sum is σ = 211211111993738. Its totient is φ = 211211111993736.

The previous prime is 211211111993621. The next prime is 211211111993773. The reversal of 211211111993737 is 737399111112112.

It is a happy number.

Together with next prime (211211111993773) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196129353335161 + 15081758658576 = 14004619^2 + 3883524^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211211111993737 is a prime.

It is a super-2 number, since 2×211211111993737² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211211111973737) 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, 105605555996868 + 105605555996869.

It is an arithmetic number, because the mean of its divisors is an integer number (105605555996869).

Almost surely, 2^{211211111993737} is an apocalyptic number.

It is an amenable number.

211211111993737 is a deficient number, since it is larger than the sum of its proper divisors (1).

211211111993737 is an equidigital number, since it uses as much as digits as its factorization.

211211111993737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 142884, while the sum is 49.

The spelling of 211211111993737 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred eleven million, nine hundred ninety-three thousand, seven hundred thirty-seven".