1321333001 has 4 divisors (see below), whose sum is σ = 1322729232. Its totient is φ = 1319936772.

The previous prime is 1321332997. The next prime is 1321333021. The reversal of 1321333001 is 1003331231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1321333001 - 2² = 1321332997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1321333021) 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, 696695 + ... + 698588.

It is an arithmetic number, because the mean of its divisors is an integer number (330682308).

Almost surely, 2^1321333001 is an apocalyptic number.

It is an amenable number.

1321333001 is a deficient number, since it is larger than the sum of its proper divisors (1396231).

1321333001 is an equidigital number, since it uses as much as digits as its factorization.

1321333001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396230.

The product of its (nonzero) digits is 162, while the sum is 17.

The square root of 1321333001 is about 36350.1444426291. The cubic root of 1321333001 is about 1097.3304414416.

Adding to 1321333001 its reverse (1003331231), we get a palindrome (2324664232).

The spelling of 1321333001 in words is "one billion, three hundred twenty-one million, three hundred thirty-three thousand, one".