1321135444 has 12 divisors (see below), whose sum is σ = 2315290068. Its totient is φ = 659624000.

The previous prime is 1321135429. The next prime is 1321135451. The reversal of 1321135444 is 4445311231.

It can be written as a sum of positive squares in 2 ways, for example, as 1237632400 + 83503044 = 35180^2 + 9138^2 .

It is a super-2 number, since 2×1321135444² = 3490797722786154272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232777 + ... + 238384.

It is an arithmetic number, because the mean of its divisors is an integer number (192940839).

Almost surely, 2^1321135444 is an apocalyptic number.

It is an amenable number.

1321135444 is a deficient number, since it is larger than the sum of its proper divisors (994154624).

1321135444 is a wasteful number, since it uses less digits than its factorization.

1321135444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471866 (or 471864 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 1321135444 is about 36347.4269240616. The cubic root of 1321135444 is about 1097.2757501779.

Adding to 1321135444 its reverse (4445311231), we get a palindrome (5766446675).

The spelling of 1321135444 in words is "one billion, three hundred twenty-one million, one hundred thirty-five thousand, four hundred forty-four".