1321242020040 has 32 divisors (see below), whose sum is σ = 3963726060480. Its totient is φ = 352331205312.

The previous prime is 1321242020029. The next prime is 1321242020047. The reversal of 1321242020040 is 400202421231.

It is a junction number, because it is equal to n+sod(n) for n = 1321242019989 and 1321242020016.

It is not an unprimeable number, because it can be changed into a prime (1321242020047) 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, 5505174964 + ... + 5505175203.

It is an arithmetic number, because the mean of its divisors is an integer number (123866439390).

Almost surely, 2^{1321242020040} is an apocalyptic number.

1321242020040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321242020040 is an abundant number, since it is smaller than the sum of its proper divisors (2642484040440).

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

1321242020040 is a wasteful number, since it uses less digits than its factorization.

1321242020040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11010350181 (or 11010350177 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 1321242020040 its reverse (400202421231), we get a palindrome (1721444441271).

The spelling of 1321242020040 in words is "one trillion, three hundred twenty-one billion, two hundred forty-two million, twenty thousand, forty".