1320120221000 has 320 divisors, whose sum is σ = 3665186928000. Its totient is φ = 444893500800.

The previous prime is 1320120220973. The next prime is 1320120221089. The reversal of 1320120221000 is 1220210231.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

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 79 ways as a sum of consecutive naturals, for example, 141654341 + ... + 141663659.

It is an arithmetic number, because the mean of its divisors is an integer number (11453709150).

Almost surely, 2^{1320120221000} is an apocalyptic number.

1320120221000 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 1320120221000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1832593464000).

1320120221000 is an abundant number, since it is smaller than the sum of its proper divisors (2345066707000).

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

1320120221000 is an frugal number, since it uses more digits than its factorization.

1320120221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9427 (or 9392 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 1320120221000 its reverse (1220210231), we get a palindrome (1321340431231).

The spelling of 1320120221000 in words is "one trillion, three hundred twenty billion, one hundred twenty million, two hundred twenty-one thousand".