1321533023 has 4 divisors (see below), whose sum is σ = 1321629360. Its totient is φ = 1321436688.

The previous prime is 1321533019. The next prime is 1321533043. The reversal of 1321533023 is 3203351231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3203351231 = 1049 ⋅3053719.

It is a cyclic number.

It is not a de Polignac number, because 1321533023 - 2² = 1321533019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321533023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321533013) 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, 23318 + ... + 56451.

It is an arithmetic number, because the mean of its divisors is an integer number (330407340).

Almost surely, 2^1321533023 is an apocalyptic number.

1321533023 is a deficient number, since it is larger than the sum of its proper divisors (96337).

1321533023 is an equidigital number, since it uses as much as digits as its factorization.

1321533023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96336.

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

The square root of 1321533023 is about 36352.8956618314. The cubic root of 1321533023 is about 1097.3858095573.

Adding to 1321533023 its reverse (3203351231), we get a palindrome (4524884254).

The spelling of 1321533023 in words is "one billion, three hundred twenty-one million, five hundred thirty-three thousand, twenty-three".