320639021402 has 24 divisors (see below), whose sum is σ = 592393105044. Its totient is φ = 129333386112.

The previous prime is 320639021377. The next prime is 320639021407. The reversal of 320639021402 is 204120936023.

It can be written as a sum of positive squares in 2 ways, for example, as 320592631681 + 46389721 = 566209^2 + 6811^2 .

It is not an unprimeable number, because it can be changed into a prime (320639021407) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 96228533 + ... + 96231864.

Almost surely, 2^320639021402 is an apocalyptic number.

320639021402 is a deficient number, since it is larger than the sum of its proper divisors (271754083642).

320639021402 is a wasteful number, since it uses less digits than its factorization.

320639021402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192460430 (or 192460423 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

Adding to 320639021402 its reverse (204120936023), we get a palindrome (524759957425).

The spelling of 320639021402 in words is "three hundred twenty billion, six hundred thirty-nine million, twenty-one thousand, four hundred two".