8323251721 has 4 divisors (see below), whose sum is σ = 8591743744. Its totient is φ = 8054759700.

The previous prime is 8323251709. The next prime is 8323251737. The reversal of 8323251721 is 1271523238.

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 8323251721 - 2⁷ = 8323251593 is a prime.

It is a super-2 number, since 2×8323251721² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8323251421) 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, 134245965 + ... + 134246026.

It is an arithmetic number, because the mean of its divisors is an integer number (2147935936).

Almost surely, 2^8323251721 is an apocalyptic number.

It is an amenable number.

8323251721 is a deficient number, since it is larger than the sum of its proper divisors (268492023).

8323251721 is a wasteful number, since it uses less digits than its factorization.

8323251721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268492022.

The product of its digits is 20160, while the sum is 34.

The square root of 8323251721 is about 91231.8569415311. The cubic root of 8323251721 is about 2026.5827565669.

Adding to 8323251721 its reverse (1271523238), we get a palindrome (9594774959).

The spelling of 8323251721 in words is "eight billion, three hundred twenty-three million, two hundred fifty-one thousand, seven hundred twenty-one".