1321113040 has 40 divisors (see below), whose sum is σ = 3307866408. Its totient is φ = 487795200.

The previous prime is 1321112953. The next prime is 1321113049. The reversal of 1321113040 is 403111231.

It can be written as a sum of positive squares in 4 ways, for example, as 112021056 + 1209091984 = 10584^2 + 34772^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321113049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 634111 + ... + 636190.

Almost surely, 2^1321113040 is an apocalyptic number.

1321113040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321113040 is an abundant number, since it is smaller than the sum of its proper divisors (1986753368).

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

1321113040 is a wasteful number, since it uses less digits than its factorization.

1321113040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270327 (or 1270321 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1321113040 is about 36347.1187303753. The cubic root of 1321113040 is about 1097.2695475575.

Adding to 1321113040 its reverse (403111231), we get a palindrome (1724224271).

The spelling of 1321113040 in words is "one billion, three hundred twenty-one million, one hundred thirteen thousand, forty".