1321100444 has 6 divisors (see below), whose sum is σ = 2311925784. Its totient is φ = 660550220.

The previous prime is 1321100441. The next prime is 1321100449. The reversal of 1321100444 is 4440011231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321100441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165137552 + ... + 165137559.

It is an arithmetic number, because the mean of its divisors is an integer number (385320964).

Almost surely, 2^1321100444 is an apocalyptic number.

It is an amenable number.

1321100444 is a deficient number, since it is larger than the sum of its proper divisors (990825340).

1321100444 is a wasteful number, since it uses less digits than its factorization.

1321100444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330275115 (or 330275113 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1321100444 is about 36346.9454562553. The cubic root of 1321100444 is about 1097.2660602831.

Adding to 1321100444 its reverse (4440011231), we get a palindrome (5761111675).

The spelling of 1321100444 in words is "one billion, three hundred twenty-one million, one hundred thousand, four hundred forty-four".