1321433536 has 56 divisors (see below), whose sum is σ = 2743017120. Its totient is φ = 631617536.

The previous prime is 1321433507. The next prime is 1321433539. The reversal of 1321433536 is 6353341231.

It is a junction number, because it is equal to n+sod(n) for n = 1321433498 and 1321433507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321433539) 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, 777840 + ... + 779536.

Almost surely, 2^1321433536 is an apocalyptic number.

1321433536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321433536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1371508560).

1321433536 is an abundant number, since it is smaller than the sum of its proper divisors (1421583584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321433536 is an frugal number, since it uses more digits than its factorization.

1321433536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778 (or 1722 counting only the distinct ones).

The product of its digits is 19440, while the sum is 31.

The square root of 1321433536 is about 36351.5272856589. The cubic root of 1321433536 is about 1097.3582712463.

Adding to 1321433536 its reverse (6353341231), we get a palindrome (7674774767).

The spelling of 1321433536 in words is "one billion, three hundred twenty-one million, four hundred thirty-three thousand, five hundred thirty-six".