211722384389 has 4 divisors (see below), whose sum is σ = 212819391756. Its totient is φ = 210625377024.

The previous prime is 211722384373. The next prime is 211722384427. The reversal of 211722384389 is 983483227112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 127945713025 + 83776671364 = 357695^2 + 289442^2 .

It is a cyclic number.

It is not a de Polignac number, because 211722384389 - 2⁴ = 211722384373 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 (211722384989) 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, 548503394 + ... + 548503779.

It is an arithmetic number, because the mean of its divisors is an integer number (53204847939).

Almost surely, 2^211722384389 is an apocalyptic number.

It is an amenable number.

211722384389 is a deficient number, since it is larger than the sum of its proper divisors (1097007367).

211722384389 is a wasteful number, since it uses less digits than its factorization.

211722384389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097007366.

The product of its digits is 1161216, while the sum is 50.

The spelling of 211722384389 in words is "two hundred eleven billion, seven hundred twenty-two million, three hundred eighty-four thousand, three hundred eighty-nine".