8000023721 has 2 divisors, whose sum is σ = 8000023722. Its totient is φ = 8000023720.

The previous prime is 8000023657. The next prime is 8000023741. The reversal of 8000023721 is 1273200008.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6450499225 + 1549524496 = 80315^2 + 39364^2 .

It is a cyclic number.

It is not a de Polignac number, because 8000023721 - 2⁶ = 8000023657 is a prime.

It is a super-3 number, since 3×8000023721³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (8000023741) 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 as a sum of consecutive naturals, namely, 4000011860 + 4000011861.

It is an arithmetic number, because the mean of its divisors is an integer number (4000011861).

Almost surely, 2^8000023721 is an apocalyptic number.

It is an amenable number.

8000023721 is a deficient number, since it is larger than the sum of its proper divisors (1).

8000023721 is an equidigital number, since it uses as much as digits as its factorization.

8000023721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 8000023721 is about 89442.8517043145. The cubic root of 8000023721 is about 2000.0019767480.

Adding to 8000023721 its reverse (1273200008), we get a palindrome (9273223729).

The spelling of 8000023721 in words is "eight billion, twenty-three thousand, seven hundred twenty-one".