1321120040 has 64 divisors (see below), whose sum is σ = 3069480960. Its totient is φ = 511418880.

The previous prime is 1321120013. The next prime is 1321120043. The reversal of 1321120040 is 400211231.

It is a junction number, because it is equal to n+sod(n) for n = 1321119997 and 1321120024.

It is not an unprimeable number, because it can be changed into a prime (1321120043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205109 + ... + 211451.

It is an arithmetic number, because the mean of its divisors is an integer number (47960640).

Almost surely, 2^1321120040 is an apocalyptic number.

1321120040 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 1321120040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1534740480).

1321120040 is an abundant number, since it is smaller than the sum of its proper divisors (1748360920).

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

1321120040 is a wasteful number, since it uses less digits than its factorization.

1321120040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6522 (or 6518 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1321120040 is about 36347.2150239877. The cubic root of 1321120040 is about 1097.2714855378.

Adding to 1321120040 its reverse (400211231), we get a palindrome (1721331271).

The spelling of 1321120040 in words is "one billion, three hundred twenty-one million, one hundred twenty thousand, forty".