1321004428 has 24 divisors (see below), whose sum is σ = 2374569792. Its totient is φ = 642794064.

The previous prime is 1321004417. The next prime is 1321004429. The reversal of 1321004428 is 8244001231.

It is not an unprimeable number, because it can be changed into a prime (1321004429) 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, 7450 + ... + 51937.

It is an arithmetic number, because the mean of its divisors is an integer number (98940408).

Almost surely, 2^1321004428 is an apocalyptic number.

It is an amenable number.

1321004428 is a deficient number, since it is larger than the sum of its proper divisors (1053565364).

1321004428 is a wasteful number, since it uses less digits than its factorization.

1321004428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59541 (or 59539 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 1321004428 is about 36345.6246059962. The cubic root of 1321004428 is about 1097.2394769775.

Adding to 1321004428 its reverse (8244001231), we get a palindrome (9565005659).

The spelling of 1321004428 in words is "one billion, three hundred twenty-one million, four thousand, four hundred twenty-eight".