7221476721 has 8 divisors (see below), whose sum is σ = 9629155584. Its totient is φ = 4814057840.

The previous prime is 7221476711. The next prime is 7221476723. The reversal of 7221476721 is 1276741227.

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

It is a cyclic number.

It is not a de Polignac number, because 7221476721 - 2²¹ = 7219379569 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7221476721.

It is not an unprimeable number, because it can be changed into a prime (7221476723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13291 + ... + 120911.

It is an arithmetic number, because the mean of its divisors is an integer number (1203644448).

Almost surely, 2^7221476721 is an apocalyptic number.

It is an amenable number.

7221476721 is a deficient number, since it is larger than the sum of its proper divisors (2407678863).

7221476721 is a wasteful number, since it uses less digits than its factorization.

7221476721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129991.

The product of its digits is 65856, while the sum is 39.

The square root of 7221476721 is about 84979.2723021326. The cubic root of 7221476721 is about 1932.8968213445.

The spelling of 7221476721 in words is "seven billion, two hundred twenty-one million, four hundred seventy-six thousand, seven hundred twenty-one".