1321123211 has 2 divisors, whose sum is σ = 1321123212. Its totient is φ = 1321123210.

The previous prime is 1321123183. The next prime is 1321123247. The reversal of 1321123211 is 1123211231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321123211 - 2¹⁴ = 1321106827 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321123211.

It is not a weakly prime, because it can be changed into another prime (1321123411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660561605 + 660561606.

It is an arithmetic number, because the mean of its divisors is an integer number (660561606).

Almost surely, 2^1321123211 is an apocalyptic number.

1321123211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321123211 is an equidigital number, since it uses as much as digits as its factorization.

1321123211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 17.

The square root of 1321123211 is about 36347.2586449102. The cubic root of 1321123211 is about 1097.2723634407.

Adding to 1321123211 its reverse (1123211231), we get a palindrome (2444334442).

The spelling of 1321123211 in words is "one billion, three hundred twenty-one million, one hundred twenty-three thousand, two hundred eleven".