1321330433 has 4 divisors (see below), whose sum is σ = 1390874160. Its totient is φ = 1251786708.

The previous prime is 1321330337. The next prime is 1321330447. The reversal of 1321330433 is 3340331231.

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 1321330433 - 2¹⁸ = 1321068289 is a prime.

It is a super-2 number, since 2×1321330433² = 3491828226343934978, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321330399 and 1321330408.

It is not an unprimeable number, because it can be changed into a prime (1321330463) 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, 34771835 + ... + 34771872.

It is an arithmetic number, because the mean of its divisors is an integer number (347718540).

Almost surely, 2^1321330433 is an apocalyptic number.

It is an amenable number.

1321330433 is a deficient number, since it is larger than the sum of its proper divisors (69543727).

1321330433 is an equidigital number, since it uses as much as digits as its factorization.

1321330433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69543726.

The product of its (nonzero) digits is 1944, while the sum is 23.

The square root of 1321330433 is about 36350.1091195061. The cubic root of 1321330433 is about 1097.3297305569.

Adding to 1321330433 its reverse (3340331231), we get a palindrome (4661661664).

The spelling of 1321330433 in words is "one billion, three hundred twenty-one million, three hundred thirty thousand, four hundred thirty-three".