1321433553 has 32 divisors (see below), whose sum is σ = 1956003840. Its totient is φ = 786839040.

The previous prime is 1321433539. The next prime is 1321433557. The reversal of 1321433553 is 3553341231.

It is not a de Polignac number, because 1321433553 - 2¹³ = 1321425361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1321433553.

It is not an unprimeable number, because it can be changed into a prime (1321433557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 580225 + ... + 582497.

It is an arithmetic number, because the mean of its divisors is an integer number (61125120).

Almost surely, 2^1321433553 is an apocalyptic number.

It is an amenable number.

1321433553 is a deficient number, since it is larger than the sum of its proper divisors (634570287).

1321433553 is a wasteful number, since it uses less digits than its factorization.

1321433553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589.

The product of its digits is 16200, while the sum is 30.

The square root of 1321433553 is about 36351.5275194867. The cubic root of 1321433553 is about 1097.3582759521.

Adding to 1321433553 its reverse (3553341231), we get a palindrome (4874774784).

The spelling of 1321433553 in words is "one billion, three hundred twenty-one million, four hundred thirty-three thousand, five hundred fifty-three".