1321320004432 has 80 divisors (see below), whose sum is σ = 2736855861760. Its totient is φ = 616132573056.

The previous prime is 1321320004429. The next prime is 1321320004463. The reversal of 1321320004432 is 2344000231231.

It is a super-2 number, since 2×1321320004432² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1321320004397 and 1321320004406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31406803 + ... + 31448845.

It is an arithmetic number, because the mean of its divisors is an integer number (34210698272).

Almost surely, 2^{1321320004432} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321320004432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1368427930880).

1321320004432 is an abundant number, since it is smaller than the sum of its proper divisors (1415535857328).

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

1321320004432 is a wasteful number, since it uses less digits than its factorization.

1321320004432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43680 (or 43674 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 1321320004432 its reverse (2344000231231), we get a palindrome (3665320235663).

The spelling of 1321320004432 in words is "one trillion, three hundred twenty-one billion, three hundred twenty million, four thousand, four hundred thirty-two".