211439768917 has 12 divisors (see below), whose sum is σ = 236341156224. Its totient is φ = 188879193360.

The previous prime is 211439768863. The next prime is 211439768951. The reversal of 211439768917 is 719867934112.

It is a happy number.

It is not a de Polignac number, because 211439768917 - 2¹⁹ = 211439244629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211439768717) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20174163 + ... + 20184640.

It is an arithmetic number, because the mean of its divisors is an integer number (19695096352).

Almost surely, 2^211439768917 is an apocalyptic number.

It is an amenable number.

211439768917 is a deficient number, since it is larger than the sum of its proper divisors (24901387307).

211439768917 is a wasteful number, since it uses less digits than its factorization.

211439768917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40358860 (or 40358847 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 58.

The spelling of 211439768917 in words is "two hundred eleven billion, four hundred thirty-nine million, seven hundred sixty-eight thousand, nine hundred seventeen".