211164517138 has 4 divisors (see below), whose sum is σ = 316746775710. Its totient is φ = 105582258568.

The previous prime is 211164517121. The next prime is 211164517141. The reversal of 211164517138 is 831715461112.

It is a happy number.

211164517138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 183755396889 + 27409120249 = 428667^2 + 165557^2 .

It is a super-2 number, since 2×211164517138² (a number of 23 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 211164517138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52791129283 + ... + 52791129286.

Almost surely, 2^211164517138 is an apocalyptic number.

211164517138 is a deficient number, since it is larger than the sum of its proper divisors (105582258572).

211164517138 is a wasteful number, since it uses less digits than its factorization.

211164517138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105582258571.

The product of its digits is 40320, while the sum is 40.

The spelling of 211164517138 in words is "two hundred eleven billion, one hundred sixty-four million, five hundred seventeen thousand, one hundred thirty-eight".