211333312321 has 16 divisors (see below), whose sum is σ = 225483457104. Its totient is φ = 197377449984.

The previous prime is 211333312279. The next prime is 211333312339. The reversal of 211333312321 is 123213333112.

It can be written as a sum of positive squares in 8 ways, for example, as 2397473296 + 208935839025 = 48964^2 + 457095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211333312321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211333312121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2011921 + ... + 2114353.

It is an arithmetic number, because the mean of its divisors is an integer number (14092716069).

Almost surely, 2^211333312321 is an apocalyptic number.

It is an amenable number.

211333312321 is a deficient number, since it is larger than the sum of its proper divisors (14150144783).

211333312321 is a wasteful number, since it uses less digits than its factorization.

211333312321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103380.

The product of its digits is 1944, while the sum is 25.

Adding to 211333312321 its reverse (123213333112), we get a palindrome (334546645433).

The spelling of 211333312321 in words is "two hundred eleven billion, three hundred thirty-three million, three hundred twelve thousand, three hundred twenty-one".