1321606411 has 4 divisors (see below), whose sum is σ = 1323236824. Its totient is φ = 1319976000.

The previous prime is 1321606397. The next prime is 1321606417. The reversal of 1321606411 is 1146061231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321606411 - 2¹⁷ = 1321475339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321606417) 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, 813990 + ... + 815611.

It is an arithmetic number, because the mean of its divisors is an integer number (330809206).

Almost surely, 2^1321606411 is an apocalyptic number.

1321606411 is a deficient number, since it is larger than the sum of its proper divisors (1630413).

1321606411 is an equidigital number, since it uses as much as digits as its factorization.

1321606411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630412.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1321606411 is about 36353.9050309592. The cubic root of 1321606411 is about 1097.4061226980.

Adding to 1321606411 its reverse (1146061231), we get a palindrome (2467667642).

The spelling of 1321606411 in words is "one billion, three hundred twenty-one million, six hundred six thousand, four hundred eleven".