1321533503243 has 8 divisors (see below), whose sum is σ = 1347090430176. Its totient is φ = 1296169459200.

The previous prime is 1321533503239. The next prime is 1321533503261. The reversal of 1321533503243 is 3423053351231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1321533503243 - 2² = 1321533503239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321533503263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48206888 + ... + 48234293.

It is an arithmetic number, because the mean of its divisors is an integer number (168386303772).

Almost surely, 2^{1321533503243} is an apocalyptic number.

1321533503243 is a deficient number, since it is larger than the sum of its proper divisors (25556926933).

1321533503243 is an equidigital number, since it uses as much as digits as its factorization.

1321533503243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96441445.

The product of its (nonzero) digits is 97200, while the sum is 35.

Adding to 1321533503243 its reverse (3423053351231), we get a palindrome (4744586854474).

The spelling of 1321533503243 in words is "one trillion, three hundred twenty-one billion, five hundred thirty-three million, five hundred three thousand, two hundred forty-three".