1321023533 has 4 divisors (see below), whose sum is σ = 1322283900. Its totient is φ = 1319763168.

The previous prime is 1321023527. The next prime is 1321023547. The reversal of 1321023533 is 3353201231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 793999684 + 527023849 = 28178^2 + 22957^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321023533 - 2¹⁸ = 1320761389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321023499 and 1321023508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321023563) 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 3 ways as a sum of consecutive naturals, for example, 628610 + ... + 630707.

It is an arithmetic number, because the mean of its divisors is an integer number (330570975).

Almost surely, 2^1321023533 is an apocalyptic number.

It is an amenable number.

1321023533 is a deficient number, since it is larger than the sum of its proper divisors (1260367).

1321023533 is a wasteful number, since it uses less digits than its factorization.

1321023533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260366.

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

The square root of 1321023533 is about 36345.8874289788. The cubic root of 1321023533 is about 1097.2447665533.

Adding to 1321023533 its reverse (3353201231), we get a palindrome (4674224764).

The spelling of 1321023533 in words is "one billion, three hundred twenty-one million, twenty-three thousand, five hundred thirty-three".