211342323221 has 2 divisors, whose sum is σ = 211342323222. Its totient is φ = 211342323220.

The previous prime is 211342323191. The next prime is 211342323223. The reversal of 211342323221 is 122323243112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 192708708196 + 18633615025 = 438986^2 + 136505^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211342323221 is a prime.

Together with 211342323223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (211342323223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105671161610 + 105671161611.

It is an arithmetic number, because the mean of its divisors is an integer number (105671161611).

Almost surely, 2^211342323221 is an apocalyptic number.

It is an amenable number.

211342323221 is a deficient number, since it is larger than the sum of its proper divisors (1).

211342323221 is an equidigital number, since it uses as much as digits as its factorization.

211342323221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 26.

Adding to 211342323221 its reverse (122323243112), we get a palindrome (333665566333).

The spelling of 211342323221 in words is "two hundred eleven billion, three hundred forty-two million, three hundred twenty-three thousand, two hundred twenty-one".