2111112121997 has 2 divisors, whose sum is σ = 2111112121998. Its totient is φ = 2111112121996.

The previous prime is 2111112121991. The next prime is 2111112122033. The reversal of 2111112121997 is 7991212111112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1735368867556 + 375743254441 = 1317334^2 + 612979^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111112121997 - 2¹⁸ = 2111111859853 is a prime.

It is a super-2 number, since 2×2111112121997² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2111112121997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2111112121991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1055556060998 + 1055556060999.

It is an arithmetic number, because the mean of its divisors is an integer number (1055556060999).

Almost surely, 2^{2111112121997} is an apocalyptic number.

It is an amenable number.

2111112121997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2111112121997 is an equidigital number, since it uses as much as digits as its factorization.

2111112121997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 38.

The spelling of 2111112121997 in words is "two trillion, one hundred eleven billion, one hundred twelve million, one hundred twenty-one thousand, nine hundred ninety-seven".