40312130321 has 4 divisors (see below), whose sum is σ = 40325099700. Its totient is φ = 40299160944.

The previous prime is 40312130317. The next prime is 40312130333. The reversal of 40312130321 is 12303121304.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11570014096 + 28742116225 = 107564^2 + 169535^2 .

It is a cyclic number.

It is not a de Polignac number, because 40312130321 - 2² = 40312130317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40312130293 and 40312130302.

It is not an unprimeable number, because it can be changed into a prime (40312130921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6480026 + ... + 6486243.

It is an arithmetic number, because the mean of its divisors is an integer number (10081274925).

Almost surely, 2^40312130321 is an apocalyptic number.

It is an amenable number.

40312130321 is a deficient number, since it is larger than the sum of its proper divisors (12969379).

40312130321 is a wasteful number, since it uses less digits than its factorization.

40312130321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12969378.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 40312130321 its reverse (12303121304), we get a palindrome (52615251625).

The spelling of 40312130321 in words is "forty billion, three hundred twelve million, one hundred thirty thousand, three hundred twenty-one".