8670353721 has 4 divisors (see below), whose sum is σ = 11560471632. Its totient is φ = 5780235812.

The previous prime is 8670353693. The next prime is 8670353729. The reversal of 8670353721 is 1273530768.

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 8670353721 - 2⁵ = 8670353689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8670353729) 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, 1445058951 + ... + 1445058956.

It is an arithmetic number, because the mean of its divisors is an integer number (2890117908).

Almost surely, 2^8670353721 is an apocalyptic number.

It is an amenable number.

8670353721 is a deficient number, since it is larger than the sum of its proper divisors (2890117911).

8670353721 is a wasteful number, since it uses less digits than its factorization.

8670353721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2890117910.

The product of its (nonzero) digits is 211680, while the sum is 42.

The square root of 8670353721 is about 93114.7341777874. The cubic root of 8670353721 is about 2054.3712965960.

The spelling of 8670353721 in words is "eight billion, six hundred seventy million, three hundred fifty-three thousand, seven hundred twenty-one".