6400338321 has 32 divisors (see below), whose sum is σ = 9321661440. Its totient is φ = 3882694464.

The previous prime is 6400338289. The next prime is 6400338331. The reversal of 6400338321 is 1238330046.

It is not a de Polignac number, because 6400338321 - 2⁵ = 6400338289 is a prime.

It is a super-2 number, since 2×6400338321² = 81928661246522198082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6400338331) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 908350 + ... + 915368.

It is an arithmetic number, because the mean of its divisors is an integer number (291301920).

Almost surely, 2^6400338321 is an apocalyptic number.

It is an amenable number.

6400338321 is a deficient number, since it is larger than the sum of its proper divisors (2921323119).

6400338321 is a wasteful number, since it uses less digits than its factorization.

6400338321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7365.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 6400338321 is about 80002.1144783061. The cubic root of 6400338321 is about 1856.6682484306.

Adding to 6400338321 its reverse (1238330046), we get a palindrome (7638668367).

The spelling of 6400338321 in words is "six billion, four hundred million, three hundred thirty-eight thousand, three hundred twenty-one".