211755985139 has 4 divisors (see below), whose sum is σ = 211919252424. Its totient is φ = 211592717856.

The previous prime is 211755985117. The next prime is 211755985141. The reversal of 211755985139 is 931589557112.

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

It is a cyclic number.

It is not a de Polignac number, because 211755985139 - 2⁸ = 211755984883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211755985159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81631697 + ... + 81634290.

It is an arithmetic number, because the mean of its divisors is an integer number (52979813106).

Almost surely, 2^211755985139 is an apocalyptic number.

211755985139 is a deficient number, since it is larger than the sum of its proper divisors (163267285).

211755985139 is a wasteful number, since it uses less digits than its factorization.

211755985139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163267284.

The product of its digits is 3402000, while the sum is 56.

The spelling of 211755985139 in words is "two hundred eleven billion, seven hundred fifty-five million, nine hundred eighty-five thousand, one hundred thirty-nine".