211111227491 has 2 divisors, whose sum is σ = 211111227492. Its totient is φ = 211111227490.

The previous prime is 211111227461. The next prime is 211111227493. The reversal of 211111227491 is 194722111112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211111227491 is a prime.

Together with 211111227493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (211111227493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105555613745 + 105555613746.

It is an arithmetic number, because the mean of its divisors is an integer number (105555613746).

Almost surely, 2^211111227491 is an apocalyptic number.

211111227491 is a deficient number, since it is larger than the sum of its proper divisors (1).

211111227491 is an equidigital number, since it uses as much as digits as its factorization.

211111227491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 32.

The spelling of 211111227491 in words is "two hundred eleven billion, one hundred eleven million, two hundred twenty-seven thousand, four hundred ninety-one".