211111109977 has 2 divisors, whose sum is σ = 211111109978. Its totient is φ = 211111109976.

The previous prime is 211111109939. The next prime is 211111110011. The reversal of 211111109977 is 779901111112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123658425801 + 87452684176 = 351651^2 + 295724^2 .

It is a cyclic number.

It is not a de Polignac number, because 211111109977 - 2⁷ = 211111109849 is a prime.

It is not a weakly prime, because it can be changed into another prime (211111104977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105555554988 + 105555554989.

It is an arithmetic number, because the mean of its divisors is an integer number (105555554989).

Almost surely, 2^211111109977 is an apocalyptic number.

It is an amenable number.

211111109977 is a deficient number, since it is larger than the sum of its proper divisors (1).

211111109977 is an equidigital number, since it uses as much as digits as its factorization.

211111109977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7938, while the sum is 40.

The spelling of 211111109977 in words is "two hundred eleven billion, one hundred eleven million, one hundred nine thousand, nine hundred seventy-seven".