1321303444 has 24 divisors (see below), whose sum is σ = 2449415808. Its totient is φ = 621505920.

The previous prime is 1321303391. The next prime is 1321303447. The reversal of 1321303444 is 4443031231.

It is a super-2 number, since 2×1321303444² = 3491685582252522272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321303447) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 264837 + ... + 269779.

It is an arithmetic number, because the mean of its divisors is an integer number (102058992).

Almost surely, 2^1321303444 is an apocalyptic number.

It is an amenable number.

1321303444 is a deficient number, since it is larger than the sum of its proper divisors (1128112364).

1321303444 is a wasteful number, since it uses less digits than its factorization.

1321303444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8895 (or 8893 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 1321303444 is about 36349.7378807606. The cubic root of 1321303444 is about 1097.3222592908.

Adding to 1321303444 its reverse (4443031231), we get a palindrome (5764334675).

The spelling of 1321303444 in words is "one billion, three hundred twenty-one million, three hundred three thousand, four hundred forty-four".