1321323122320 has 80 divisors (see below), whose sum is σ = 3100794840000. Its totient is φ = 523590096384.

The previous prime is 1321323122309. The next prime is 1321323122347. The reversal of 1321323122320 is 232213231231.

It is a tau number, because it is divible by the number of its divisors (80).

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, 75846571 + ... + 75863989.

It is an arithmetic number, because the mean of its divisors is an integer number (38759935500).

Almost surely, 2^{1321323122320} is an apocalyptic number.

1321323122320 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 1321323122320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1550397420000).

1321323122320 is an abundant number, since it is smaller than the sum of its proper divisors (1779471717680).

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

1321323122320 is a wasteful number, since it uses less digits than its factorization.

1321323122320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26240 (or 26234 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 1321323122320 its reverse (232213231231), we get a palindrome (1553536353551).

The spelling of 1321323122320 in words is "one trillion, three hundred twenty-one billion, three hundred twenty-three million, one hundred twenty-two thousand, three hundred twenty".