8471735721 has 12 divisors (see below), whose sum is σ = 12324989040. Its totient is φ = 5607191160.

The previous prime is 8471735711. The next prime is 8471735731. The reversal of 8471735721 is 1275371748.

8471735721 is a `hidden beast` number, since 8 + 4 + 7 + 1 + 73 + 572 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (8471735711) and next prime (8471735731).

It is a de Polignac number, because none of the positive numbers 2^k-8471735721 is a prime.

It is a super-2 number, since 2×8471735721² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8471735711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3384735 + ... + 3387236.

It is an arithmetic number, because the mean of its divisors is an integer number (1027082420).

Almost surely, 2^8471735721 is an apocalyptic number.

It is an amenable number.

8471735721 is a deficient number, since it is larger than the sum of its proper divisors (3853253319).

8471735721 is a wasteful number, since it uses less digits than its factorization.

8471735721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6772116 (or 6772113 counting only the distinct ones).

The product of its digits is 329280, while the sum is 45.

The square root of 8471735721 is about 92042.0323602212. The cubic root of 8471735721 is about 2038.5629794627.

The spelling of 8471735721 in words is "eight billion, four hundred seventy-one million, seven hundred thirty-five thousand, seven hundred twenty-one".