42723449321 has 6 divisors (see below), whose sum is σ = 49698706410. Its totient is φ = 36620099376.

The previous prime is 42723449257. The next prime is 42723449323. The reversal of 42723449321 is 12394432724.

It can be written as a sum of positive squares in only one way, i.e., 36124324096 + 6599125225 = 190064^2 + 81235^2 .

It is not a de Polignac number, because 42723449321 - 2⁶ = 42723449257 is a prime.

It is a super-2 number, since 2×42723449321² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42723449323) 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 5 ways as a sum of consecutive naturals, for example, 435953516 + ... + 435953613.

It is an arithmetic number, because the mean of its divisors is an integer number (8283117735).

Almost surely, 2^42723449321 is an apocalyptic number.

It is an amenable number.

42723449321 is a deficient number, since it is larger than the sum of its proper divisors (6975257089).

42723449321 is an equidigital number, since it uses as much as digits as its factorization.

42723449321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871907143 (or 871907136 counting only the distinct ones).

The product of its digits is 290304, while the sum is 41.

The spelling of 42723449321 in words is "forty-two billion, seven hundred twenty-three million, four hundred forty-nine thousand, three hundred twenty-one".