1321240040 has 32 divisors (see below), whose sum is σ = 2974855680. Its totient is φ = 528128832.

The previous prime is 1321240033. The next prime is 1321240043. The reversal of 1321240040 is 400421231.

It is not an unprimeable number, because it can be changed into a prime (1321240043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51017 + ... + 72423.

It is an arithmetic number, because the mean of its divisors is an integer number (92964240).

Almost surely, 2^1321240040 is an apocalyptic number.

1321240040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321240040 is an abundant number, since it is smaller than the sum of its proper divisors (1653615640).

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

1321240040 is a wasteful number, since it uses less digits than its factorization.

1321240040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22961 (or 22957 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 1321240040 is about 36348.8657319592. The cubic root of 1321240040 is about 1097.3047069933.

Adding to 1321240040 its reverse (400421231), we get a palindrome (1721661271).

The spelling of 1321240040 in words is "one billion, three hundred twenty-one million, two hundred forty thousand, forty".