2111218997 has 2 divisors, whose sum is σ = 2111218998. Its totient is φ = 2111218996.

The previous prime is 2111218979. The next prime is 2111218999. The reversal of 2111218997 is 7998121112.

Together with previous prime (2111218979) 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., 2002204516 + 109014481 = 44746^2 + 10441^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111218997 - 2¹⁰ = 2111217973 is a prime.

Together with 2111218999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111218999) 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, 1055609498 + 1055609499.

It is an arithmetic number, because the mean of its divisors is an integer number (1055609499).

Almost surely, 2^2111218997 is an apocalyptic number.

It is an amenable number.

2111218997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111218997 is an equidigital number, since it uses as much as digits as its factorization.

2111218997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 41.

The square root of 2111218997 is about 45948.0031883868. The cubic root of 2111218997 is about 1282.8555626305.

The spelling of 2111218997 in words is "two billion, one hundred eleven million, two hundred eighteen thousand, nine hundred ninety-seven".