1321606211 has 2 divisors, whose sum is σ = 1321606212. Its totient is φ = 1321606210.

The previous prime is 1321606193. The next prime is 1321606213. The reversal of 1321606211 is 1126061231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1321606211 - 2¹⁸ = 1321344067 is a prime.

It is a Sophie Germain prime.

Together with 1321606213, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1321606213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660803105 + 660803106.

It is an arithmetic number, because the mean of its divisors is an integer number (660803106).

Almost surely, 2^1321606211 is an apocalyptic number.

1321606211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321606211 is an equidigital number, since it uses as much as digits as its factorization.

1321606211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 1321606211 is about 36353.9022802230. The cubic root of 1321606211 is about 1097.4060673409.

Adding to 1321606211 its reverse (1126061231), we get a palindrome (2447667442).

The spelling of 1321606211 in words is "one billion, three hundred twenty-one million, six hundred six thousand, two hundred eleven".