1321000552000 has 112 divisors (see below), whose sum is σ = 3272317212528. Its totient is φ = 528261427200.

The previous prime is 1321000551929. The next prime is 1321000552021. The reversal of 1321000552000 is 2550001231.

It can be written as a sum of positive squares in 8 ways, for example, as 46504059904 + 1274496492096 = 215648^2 + 1128936^2 .

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, 33716422 + ... + 33755578.

It is an arithmetic number, because the mean of its divisors is an integer number (29217117969).

Almost surely, 2^{1321000552000} is an apocalyptic number.

1321000552000 is a gapful number since it is divisible by the number (10) 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 1321000552000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1636158606264).

1321000552000 is an abundant number, since it is smaller than the sum of its proper divisors (1951316660528).

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

1321000552000 is an equidigital number, since it uses as much as digits as its factorization.

1321000552000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43401 (or 43381 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 19.

Adding to 1321000552000 its reverse (2550001231), we get a palindrome (1323550553231).

The spelling of 1321000552000 in words is "one trillion, three hundred twenty-one billion, five hundred fifty-two thousand".