1321433128 has 16 divisors (see below), whose sum is σ = 2608092000. Its totient is φ = 625941936.

The previous prime is 1321433101. The next prime is 1321433131. The reversal of 1321433128 is 8213341231.

It is a junction number, because it is equal to n+sod(n) for n = 1321433096 and 1321433105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4346668 + ... + 4346971.

It is an arithmetic number, because the mean of its divisors is an integer number (163005750).

Almost surely, 2^1321433128 is an apocalyptic number.

It is an amenable number.

1321433128 is a deficient number, since it is larger than the sum of its proper divisors (1286658872).

1321433128 is a wasteful number, since it uses less digits than its factorization.

1321433128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8693664 (or 8693660 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 1321433128 is about 36351.5216737897. The cubic root of 1321433128 is about 1097.3581583078.

Adding to 1321433128 its reverse (8213341231), we get a palindrome (9534774359).

The spelling of 1321433128 in words is "one billion, three hundred twenty-one million, four hundred thirty-three thousand, one hundred twenty-eight".