1321006444 has 12 divisors (see below), whose sum is σ = 2312017344. Its totient is φ = 660430064.

The previous prime is 1321006433. The next prime is 1321006451. The reversal of 1321006444 is 4446001231.

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, 54714 + ... + 75070.

It is an arithmetic number, because the mean of its divisors is an integer number (192668112).

Almost surely, 2^1321006444 is an apocalyptic number.

It is an amenable number.

1321006444 is a deficient number, since it is larger than the sum of its proper divisors (991010900).

1321006444 is a wasteful number, since it uses less digits than its factorization.

1321006444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36584 (or 36582 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1321006444 is about 36345.6523397228. The cubic root of 1321006444 is about 1097.2400351471.

Adding to 1321006444 its reverse (4446001231), we get a palindrome (5767007675).

The spelling of 1321006444 in words is "one billion, three hundred twenty-one million, six thousand, four hundred forty-four".