1321332265 has 16 divisors (see below), whose sum is σ = 1731450816. Its totient is φ = 960020800.

The previous prime is 1321332247. The next prime is 1321332277. The reversal of 1321332265 is 5622331231.

It is not a de Polignac number, because 1321332265 - 2¹⁹ = 1320807977 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47034 + ... + 69676.

It is an arithmetic number, because the mean of its divisors is an integer number (108215676).

Almost surely, 2^1321332265 is an apocalyptic number.

It is an amenable number.

1321332265 is a deficient number, since it is larger than the sum of its proper divisors (410118551).

1321332265 is a wasteful number, since it uses less digits than its factorization.

1321332265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23720.

The product of its digits is 6480, while the sum is 28.

The square root of 1321332265 is about 36350.1343188715. The cubic root of 1321332265 is about 1097.3302376991.

Adding to 1321332265 its reverse (5622331231), we get a palindrome (6943663496).

The spelling of 1321332265 in words is "one billion, three hundred twenty-one million, three hundred thirty-two thousand, two hundred sixty-five".