1321444004 has 24 divisors (see below), whose sum is σ = 2375049600. Its totient is φ = 643080800.

The previous prime is 1321443989. The next prime is 1321444013. The reversal of 1321444004 is 4004441231.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3884 + ... + 51555.

It is an arithmetic number, because the mean of its divisors is an integer number (98960400).

Almost surely, 2^1321444004 is an apocalyptic number.

It is an amenable number.

1321444004 is a deficient number, since it is larger than the sum of its proper divisors (1053605596).

1321444004 is a wasteful number, since it uses less digits than its factorization.

1321444004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55603 (or 55601 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1321444004 is about 36351.6712683200. The cubic root of 1321444004 is about 1097.3611688864.

Adding to 1321444004 its reverse (4004441231), we get a palindrome (5325885235).

The spelling of 1321444004 in words is "one billion, three hundred twenty-one million, four hundred forty-four thousand, four".