211334221331 has 2 divisors, whose sum is σ = 211334221332. Its totient is φ = 211334221330.

The previous prime is 211334221321. The next prime is 211334221387. The reversal of 211334221331 is 133122433112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211334221331 is a prime.

It is a super-2 number, since 2×211334221331² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211334221331.

It is not a weakly prime, because it can be changed into another prime (211334221321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105667110665 + 105667110666.

It is an arithmetic number, because the mean of its divisors is an integer number (105667110666).

Almost surely, 2^211334221331 is an apocalyptic number.

211334221331 is a deficient number, since it is larger than the sum of its proper divisors (1).

211334221331 is an equidigital number, since it uses as much as digits as its factorization.

211334221331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

Adding to 211334221331 its reverse (133122433112), we get a palindrome (344456654443).

The spelling of 211334221331 in words is "two hundred eleven billion, three hundred thirty-four million, two hundred twenty-one thousand, three hundred thirty-one".