1321243444 has 12 divisors (see below), whose sum is σ = 2326362304. Its totient is φ = 656568504.

The previous prime is 1321243433. The next prime is 1321243447. The reversal of 1321243444 is 4443421231.

It is a super-2 number, since 2×1321243444² = 3491368476625962272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321243447) 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 3 ways as a sum of consecutive naturals, for example, 1012572 + ... + 1013875.

Almost surely, 2^1321243444 is an apocalyptic number.

It is an amenable number.

1321243444 is a deficient number, since it is larger than the sum of its proper divisors (1005118860).

1321243444 is a wasteful number, since it uses less digits than its factorization.

1321243444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2026614 (or 2026612 counting only the distinct ones).

The product of its digits is 9216, while the sum is 28.

The square root of 1321243444 is about 36348.9125559486. The cubic root of 1321243444 is about 1097.3056493459.

Adding to 1321243444 its reverse (4443421231), we get a palindrome (5764664675).

The spelling of 1321243444 in words is "one billion, three hundred twenty-one million, two hundred forty-three thousand, four hundred forty-four".