1320430521 has 16 divisors (see below), whose sum is σ = 1776031488. Its totient is φ = 872592000.

The previous prime is 1320430513. The next prime is 1320430567. The reversal of 1320430521 is 1250340231.

It is not a de Polignac number, because 1320430521 - 2³ = 1320430513 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1320430021) 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 in 15 ways as a sum of consecutive naturals, for example, 162096 + ... + 170046.

It is an arithmetic number, because the mean of its divisors is an integer number (111001968).

Almost surely, 2^1320430521 is an apocalyptic number.

It is an amenable number.

1320430521 is a deficient number, since it is larger than the sum of its proper divisors (455600967).

1320430521 is a wasteful number, since it uses less digits than its factorization.

1320430521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8432.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1320430521 is about 36337.7286164119. The cubic root of 1320430521 is about 1097.0805563315.

Adding to 1320430521 its reverse (1250340231), we get a palindrome (2570770752).

The spelling of 1320430521 in words is "one billion, three hundred twenty million, four hundred thirty thousand, five hundred twenty-one".