4391267721 has 8 divisors (see below), whose sum is σ = 5871801600. Its totient is φ = 2919122832.

The previous prime is 4391267717. The next prime is 4391267723. The reversal of 4391267721 is 1277621934.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4391267721 - 2² = 4391267717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4391267723) 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 7 ways as a sum of consecutive naturals, for example, 2096025 + ... + 2098118.

It is an arithmetic number, because the mean of its divisors is an integer number (733975200).

Almost surely, 2^4391267721 is an apocalyptic number.

It is an amenable number.

4391267721 is a deficient number, since it is larger than the sum of its proper divisors (1480533879).

4391267721 is a wasteful number, since it uses less digits than its factorization.

4391267721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4194495.

The product of its digits is 127008, while the sum is 42.

The square root of 4391267721 is about 66266.6410873525. The cubic root of 4391267721 is about 1637.5578017861.

The spelling of 4391267721 in words is "four billion, three hundred ninety-one million, two hundred sixty-seven thousand, seven hundred twenty-one".