8123253721 has 8 divisors (see below), whose sum is σ = 8865301824. Its totient is φ = 7381800720.

The previous prime is 8123253679. The next prime is 8123253737. The reversal of 8123253721 is 1273523218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8123253721 - 2¹¹ = 8123251673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8123253421) 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 7 ways as a sum of consecutive naturals, for example, 119986 + ... + 175051.

It is an arithmetic number, because the mean of its divisors is an integer number (1108162728).

Almost surely, 2^8123253721 is an apocalyptic number.

It is an amenable number.

8123253721 is a deficient number, since it is larger than the sum of its proper divisors (742048103).

8123253721 is a wasteful number, since it uses less digits than its factorization.

8123253721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297551.

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

The square root of 8123253721 is about 90129.0947530263. The cubic root of 8123253721 is about 2010.2188421245.

Adding to 8123253721 its reverse (1273523218), we get a palindrome (9396776939).

The spelling of 8123253721 in words is "eight billion, one hundred twenty-three million, two hundred fifty-three thousand, seven hundred twenty-one".