4243473721 has 4 divisors (see below), whose sum is σ = 4301603572. Its totient is φ = 4185343872.

The previous prime is 4243473709. The next prime is 4243473739. The reversal of 4243473721 is 1273743424.

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 2448765225 + 1794708496 = 49485^2 + 42364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4243473721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4243473821) 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 3 ways as a sum of consecutive naturals, for example, 29064816 + ... + 29064961.

It is an arithmetic number, because the mean of its divisors is an integer number (1075400893).

Almost surely, 2^4243473721 is an apocalyptic number.

It is an amenable number.

4243473721 is a deficient number, since it is larger than the sum of its proper divisors (58129851).

4243473721 is an equidigital number, since it uses as much as digits as its factorization.

4243473721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58129850.

The product of its digits is 112896, while the sum is 37.

The square root of 4243473721 is about 65141.9505464796. The cubic root of 4243473721 is about 1618.9763538987.

The spelling of 4243473721 in words is "four billion, two hundred forty-three million, four hundred seventy-three thousand, seven hundred twenty-one".