1321330121000 has 128 divisors (see below), whose sum is σ = 3154026470400. Its totient is φ = 517938220800.

The previous prime is 1321330120861. The next prime is 1321330121011. The reversal of 1321330121000 is 1210331231.

It is a self number, because there is not a number n which added to its sum of digits gives 1321330121000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45512489 + ... + 45541511.

It is an arithmetic number, because the mean of its divisors is an integer number (24640831800).

Almost surely, 2^{1321330121000} is an apocalyptic number.

1321330121000 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 1321330121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1577013235200).

1321330121000 is an abundant number, since it is smaller than the sum of its proper divisors (1832696349400).

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

1321330121000 is a wasteful number, since it uses less digits than its factorization.

1321330121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29956 (or 29942 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 1321330121000 its reverse (1210331231), we get a palindrome (1322540452231).

The spelling of 1321330121000 in words is "one trillion, three hundred twenty-one billion, three hundred thirty million, one hundred twenty-one thousand".