211665419971 has 2 divisors, whose sum is σ = 211665419972. Its totient is φ = 211665419970.

The previous prime is 211665419899. The next prime is 211665420013. The reversal of 211665419971 is 179914566112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211665419971 - 2²⁷ = 211531202243 is a prime.

It is a super-2 number, since 2×211665419971² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211665419071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105832709985 + 105832709986.

It is an arithmetic number, because the mean of its divisors is an integer number (105832709986).

Almost surely, 2^211665419971 is an apocalyptic number.

211665419971 is a deficient number, since it is larger than the sum of its proper divisors (1).

211665419971 is an equidigital number, since it uses as much as digits as its factorization.

211665419971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 52.

The spelling of 211665419971 in words is "two hundred eleven billion, six hundred sixty-five million, four hundred nineteen thousand, nine hundred seventy-one".