1321211323 has 4 divisors (see below), whose sum is σ = 1323266728. Its totient is φ = 1319155920.

The previous prime is 1321211317. The next prime is 1321211329. The reversal of 1321211323 is 3231121231.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1321211317) and next prime (1321211329).

It is a cyclic number.

It is not a de Polignac number, because 1321211323 - 2⁵ = 1321211291 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321211323.

It is not an unprimeable number, because it can be changed into a prime (1321211329) 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, 1026738 + ... + 1028023.

It is an arithmetic number, because the mean of its divisors is an integer number (330816682).

Almost surely, 2^1321211323 is an apocalyptic number.

1321211323 is a deficient number, since it is larger than the sum of its proper divisors (2055405).

1321211323 is an equidigital number, since it uses as much as digits as its factorization.

1321211323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055404.

The product of its digits is 216, while the sum is 19.

The square root of 1321211323 is about 36348.4707106090. The cubic root of 1321211323 is about 1097.2967570053.

Adding to 1321211323 its reverse (3231121231), we get a palindrome (4552332554).

The spelling of 1321211323 in words is "one billion, three hundred twenty-one million, two hundred eleven thousand, three hundred twenty-three".