1321240444 has 12 divisors (see below), whose sum is σ = 2325537144. Its totient is φ = 656801264.

The previous prime is 1321240441. The next prime is 1321240447. The reversal of 1321240444 is 4440421231.

It is an interprime number because it is at equal distance from previous prime (1321240441) and next prime (1321240447).

It is a super-2 number, since 2×1321240444² = 3491352621722634272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321240441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 953962 + ... + 955345.

It is an arithmetic number, because the mean of its divisors is an integer number (193794762).

Almost surely, 2^1321240444 is an apocalyptic number.

It is an amenable number.

1321240444 is a deficient number, since it is larger than the sum of its proper divisors (1004296700).

1321240444 is a wasteful number, since it uses less digits than its factorization.

1321240444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1909484 (or 1909482 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 1321240444 is about 36348.8712892161. The cubic root of 1321240444 is about 1097.3048188355.

Adding to 1321240444 its reverse (4440421231), we get a palindrome (5761661675).

The spelling of 1321240444 in words is "one billion, three hundred twenty-one million, two hundred forty thousand, four hundred forty-four".