8467442721 has 6 divisors (see below), whose sum is σ = 12230750610. Its totient is φ = 5644961808.

The previous prime is 8467442719. The next prime is 8467442743. The reversal of 8467442721 is 1272447648.

8467442721 is a `hidden beast` number, since 84 + 67 + 442 + 72 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7074660321 + 1392782400 = 84111^2 + 37320^2 .

It is not a de Polignac number, because 8467442721 - 2¹ = 8467442719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8467442821) 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 5 ways as a sum of consecutive naturals, for example, 470413476 + ... + 470413493.

It is an arithmetic number, because the mean of its divisors is an integer number (2038458435).

Almost surely, 2^8467442721 is an apocalyptic number.

It is an amenable number.

8467442721 is a deficient number, since it is larger than the sum of its proper divisors (3763307889).

8467442721 is a wasteful number, since it uses less digits than its factorization.

8467442721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 940826975 (or 940826972 counting only the distinct ones).

The product of its digits is 602112, while the sum is 45.

The square root of 8467442721 is about 92018.7085379924. The cubic root of 8467442721 is about 2038.2185781955.

The spelling of 8467442721 in words is "eight billion, four hundred sixty-seven million, four hundred forty-two thousand, seven hundred twenty-one".