1321230211 has 4 divisors (see below), whose sum is σ = 1509977392. Its totient is φ = 1132483032.

The previous prime is 1321230143. The next prime is 1321230221. The reversal of 1321230211 is 1120321231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1120321231 = 89 ⋅12587879.

It is a cyclic number.

It is not a de Polignac number, because 1321230211 - 2¹⁹ = 1320705923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321230221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94373580 + ... + 94373593.

It is an arithmetic number, because the mean of its divisors is an integer number (377494348).

Almost surely, 2^1321230211 is an apocalyptic number.

1321230211 is a deficient number, since it is larger than the sum of its proper divisors (188747181).

1321230211 is an equidigital number, since it uses as much as digits as its factorization.

1321230211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188747180.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1321230211 is about 36348.7305280391. The cubic root of 1321230211 is about 1097.3019859549.

Adding to 1321230211 its reverse (1120321231), we get a palindrome (2441551442).

The spelling of 1321230211 in words is "one billion, three hundred twenty-one million, two hundred thirty thousand, two hundred eleven".