8460621721 has 4 divisors (see below), whose sum is σ = 8478739152. Its totient is φ = 8442504292.

The previous prime is 8460621679. The next prime is 8460621809. The reversal of 8460621721 is 1271260648.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8460621721 - 2⁷ = 8460621593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8460622721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9058015 + ... + 9058948.

It is an arithmetic number, because the mean of its divisors is an integer number (2119684788).

Almost surely, 2^8460621721 is an apocalyptic number.

It is an amenable number.

8460621721 is a deficient number, since it is larger than the sum of its proper divisors (18117431).

8460621721 is a wasteful number, since it uses less digits than its factorization.

8460621721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18117430.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 8460621721 is about 91981.6379556268. The cubic root of 8460621721 is about 2037.6711313774.

The spelling of 8460621721 in words is "eight billion, four hundred sixty million, six hundred twenty-one thousand, seven hundred twenty-one".