1321332305 has 4 divisors (see below), whose sum is σ = 1585598772. Its totient is φ = 1057065840.

The previous prime is 1321332289. The next prime is 1321332349. The reversal of 1321332305 is 5032331231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5032331231 = 107 ⋅47031133.

It can be written as a sum of positive squares in 2 ways, for example, as 729432064 + 591900241 = 27008^2 + 24329^2 .

It is not a de Polignac number, because 1321332305 - 2⁴ = 1321332289 is a prime.

It is a super-2 number, since 2×1321332305² = 3491838120473226050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132133226 + ... + 132133235.

It is an arithmetic number, because the mean of its divisors is an integer number (396399693).

Almost surely, 2^1321332305 is an apocalyptic number.

It is an amenable number.

1321332305 is a deficient number, since it is larger than the sum of its proper divisors (264266467).

1321332305 is an equidigital number, since it uses as much as digits as its factorization.

1321332305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264266466.

The product of its (nonzero) digits is 1620, while the sum is 23.

The square root of 1321332305 is about 36350.1348690758. The cubic root of 1321332305 is about 1097.3302487720.

Adding to 1321332305 its reverse (5032331231), we get a palindrome (6353663536).

The spelling of 1321332305 in words is "one billion, three hundred twenty-one million, three hundred thirty-two thousand, three hundred five".