1321771599792 has 480 divisors, whose sum is σ = 4689883756800. Its totient is φ = 354151139328.

The previous prime is 1321771599773. The next prime is 1321771599839. The reversal of 1321771599792 is 2979951771231.

1321771599792 is a `hidden beast` number, since 1 + 32 + 1 + 7 + 7 + 1 + 599 + 7 + 9 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 101832759 + ... + 101845737.

It is an arithmetic number, because the mean of its divisors is an integer number (9770591160).

Almost surely, 2^{1321771599792} is an apocalyptic number.

1321771599792 is a gapful number since it is divisible by the number (12) 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 1321771599792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2344941878400).

1321771599792 is an abundant number, since it is smaller than the sum of its proper divisors (3368112157008).

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

1321771599792 is a wasteful number, since it uses less digits than its factorization.

1321771599792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13310 (or 13291 counting only the distinct ones).

The product of its digits is 15002820, while the sum is 63.

The spelling of 1321771599792 in words is "one trillion, three hundred twenty-one billion, seven hundred seventy-one million, five hundred ninety-nine thousand, seven hundred ninety-two".