1321341304420 has 72 divisors (see below), whose sum is σ = 2931634440504. Its totient is φ = 500190792192.

The previous prime is 1321341304403. The next prime is 1321341304429. The reversal of 1321341304420 is 244031431231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10714734144 + 1310626570276 = 103512^2 + 1144826^2 .

It is a super-2 number, since 2×1321341304420² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321341304429) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 6784642 + ... + 6976678.

It is an arithmetic number, because the mean of its divisors is an integer number (40717145007).

Almost surely, 2^{1321341304420} is an apocalyptic number.

1321341304420 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 1321341304420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1465817220252).

1321341304420 is an abundant number, since it is smaller than the sum of its proper divisors (1610293136084).

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

1321341304420 is a wasteful number, since it uses less digits than its factorization.

1321341304420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193037 (or 193016 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1321341304420 its reverse (244031431231), we get a palindrome (1565372735651).

The spelling of 1321341304420 in words is "one trillion, three hundred twenty-one billion, three hundred forty-one million, three hundred four thousand, four hundred twenty".