8271372721 has 8 divisors (see below), whose sum is σ = 8557615080. Its totient is φ = 7985198592.

The previous prime is 8271372701. The next prime is 8271372817. The reversal of 8271372721 is 1272731728.

It can be written as a sum of positive squares in 4 ways, for example, as 3192815025 + 5078557696 = 56505^2 + 71264^2 .

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 8271372721 - 2²¹ = 8269275569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8271372701) 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, 418171 + ... + 437503.

It is an arithmetic number, because the mean of its divisors is an integer number (1069701885).

Almost surely, 2^8271372721 is an apocalyptic number.

It is an amenable number.

8271372721 is a deficient number, since it is larger than the sum of its proper divisors (286242359).

8271372721 is a wasteful number, since it uses less digits than its factorization.

8271372721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34115.

The product of its digits is 65856, while the sum is 40.

The square root of 8271372721 is about 90947.0874794790. The cubic root of 8271372721 is about 2022.3634005397.

The spelling of 8271372721 in words is "eight billion, two hundred seventy-one million, three hundred seventy-two thousand, seven hundred twenty-one".