1321300421540 has 96 divisors (see below), whose sum is σ = 3098181550464. Its totient is φ = 469176744960.

The previous prime is 1321300421503. The next prime is 1321300421627. The reversal of 1321300421540 is 451240031231.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41201192 + ... + 41233248.

It is an arithmetic number, because the mean of its divisors is an integer number (32272724484).

Almost surely, 2^{1321300421540} is an apocalyptic number.

1321300421540 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 1321300421540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1549090775232).

1321300421540 is an abundant number, since it is smaller than the sum of its proper divisors (1776881128924).

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

1321300421540 is a wasteful number, since it uses less digits than its factorization.

1321300421540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36477 (or 36475 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

Adding to 1321300421540 its reverse (451240031231), we get a palindrome (1772540452771).

The spelling of 1321300421540 in words is "one trillion, three hundred twenty-one billion, three hundred million, four hundred twenty-one thousand, five hundred forty".