8467120721 has 4 divisors (see below), whose sum is σ = 8502254244. Its totient is φ = 8431987200.

The previous prime is 8467120703. The next prime is 8467120729. The reversal of 8467120721 is 1270217648.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5980702225 + 2486418496 = 77335^2 + 49864^2 .

It is a cyclic number.

It is not a de Polignac number, because 8467120721 - 2²⁶ = 8400011857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8467120729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17566400 + ... + 17566881.

It is an arithmetic number, because the mean of its divisors is an integer number (2125563561).

Almost surely, 2^8467120721 is an apocalyptic number.

It is an amenable number.

8467120721 is a deficient number, since it is larger than the sum of its proper divisors (35133523).

8467120721 is a wasteful number, since it uses less digits than its factorization.

8467120721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35133522.

The product of its (nonzero) digits is 37632, while the sum is 38.

The square root of 8467120721 is about 92016.9588771548. The cubic root of 8467120721 is about 2038.1927414023.

The spelling of 8467120721 in words is "eight billion, four hundred sixty-seven million, one hundred twenty thousand, seven hundred twenty-one".