211984345 has 32 divisors (see below), whose sum is σ = 272160000. Its totient is φ = 158242560.

The previous prime is 211984343. The next prime is 211984351. The reversal of 211984345 is 543489112.

211984345 is a nontrivial binomial coefficient, being equal to C(20591, 2).

It is not a de Polignac number, because 211984345 - 2¹ = 211984343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211984343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 607231 + ... + 607579.

It is an arithmetic number, because the mean of its divisors is an integer number (8505000).

Almost surely, 2^211984345 is an apocalyptic number.

211984345 is the 20590-th triangular number.

211984345 is the 6864-th centered nonagonal number.

It is an amenable number.

211984345 is a deficient number, since it is larger than the sum of its proper divisors (60175655).

211984345 is a wasteful number, since it uses less digits than its factorization.

211984345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513.

The product of its digits is 34560, while the sum is 37.

The square root of 211984345 is about 14559.6821737289. The cubic root of 211984345 is about 596.2585182796.

The spelling of 211984345 in words is "two hundred eleven million, nine hundred eighty-four thousand, three hundred forty-five".