1321240451020 has 24 divisors (see below), whose sum is σ = 3170977082784. Its totient is φ = 452996726016.

The previous prime is 1321240450997. The next prime is 1321240451029. The reversal of 1321240451020 is 201540421231.

It is not an unprimeable number, because it can be changed into a prime (1321240451029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4718715757 + ... + 4718716036.

It is an arithmetic number, because the mean of its divisors is an integer number (132124045116).

Almost surely, 2^{1321240451020} is an apocalyptic number.

1321240451020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321240451020 is an abundant number, since it is smaller than the sum of its proper divisors (1849736631764).

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

1321240451020 is a wasteful number, since it uses less digits than its factorization.

1321240451020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9437431809 (or 9437431807 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 1321240451020 its reverse (201540421231), we get a palindrome (1522780872251).

The spelling of 1321240451020 in words is "one trillion, three hundred twenty-one billion, two hundred forty million, four hundred fifty-one thousand, twenty".