221111211187 has 2 divisors, whose sum is σ = 221111211188. Its totient is φ = 221111211186.

The previous prime is 221111211179. The next prime is 221111211221. The reversal of 221111211187 is 781112111122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221111211187 - 2³ = 221111211179 is a prime.

It is a super-2 number, since 2×221111211187² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221111211107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110555605593 + 110555605594.

It is an arithmetic number, because the mean of its divisors is an integer number (110555605594).

Almost surely, 2^221111211187 is an apocalyptic number.

221111211187 is a deficient number, since it is larger than the sum of its proper divisors (1).

221111211187 is an equidigital number, since it uses as much as digits as its factorization.

221111211187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 448, while the sum is 28.

The spelling of 221111211187 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred eleven thousand, one hundred eighty-seven".