4479817721 has 2 divisors, whose sum is σ = 4479817722. Its totient is φ = 4479817720.

The previous prime is 4479817711. The next prime is 4479817723. The reversal of 4479817721 is 1277189744.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4258998121 + 220819600 = 65261^2 + 14860^2 .

It is a cyclic number.

It is not a de Polignac number, because 4479817721 - 2²² = 4475623417 is a prime.

Together with 4479817723, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4479817721.

It is not a weakly prime, because it can be changed into another prime (4479817723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2239908860 + 2239908861.

It is an arithmetic number, because the mean of its divisors is an integer number (2239908861).

Almost surely, 2^4479817721 is an apocalyptic number.

It is an amenable number.

4479817721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4479817721 is an equidigital number, since it uses as much as digits as its factorization.

4479817721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 50.

The square root of 4479817721 is about 66931.4404521522. The cubic root of 4479817721 is about 1648.4917617701.

The spelling of 4479817721 in words is "four billion, four hundred seventy-nine million, eight hundred seventeen thousand, seven hundred twenty-one".