1321220331120 has 160 divisors (see below), whose sum is σ = 4109067002880. Its totient is φ = 351184204800.

The previous prime is 1321220331107. The next prime is 1321220331133. The reversal of 1321220331120 is 211330221231.

It is an interprime number because it is at equal distance from previous prime (1321220331107) and next prime (1321220331133).

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 133438170 + ... + 133448070.

It is an arithmetic number, because the mean of its divisors is an integer number (25681668768).

Almost surely, 2^{1321220331120} is an apocalyptic number.

1321220331120 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 1321220331120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2054533501440).

1321220331120 is an abundant number, since it is smaller than the sum of its proper divisors (2787846671760).

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

1321220331120 is a wasteful number, since it uses less digits than its factorization.

1321220331120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11663 (or 11657 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1321220331120 its reverse (211330221231), we get a palindrome (1532550552351).

The spelling of 1321220331120 in words is "one trillion, three hundred twenty-one billion, two hundred twenty million, three hundred thirty-one thousand, one hundred twenty".