8108436721 has 16 divisors (see below), whose sum is σ = 10548753408. Its totient is φ = 6043554000.

The previous prime is 8108436697. The next prime is 8108436727. The reversal of 8108436721 is 1276348018.

It is not a de Polignac number, because 8108436721 - 2⁷ = 8108436593 is a prime.

It is a super-2 number, since 2×8108436721² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8108436727) 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 15 ways as a sum of consecutive naturals, for example, 2287455 + ... + 2290996.

It is an arithmetic number, because the mean of its divisors is an integer number (659297088).

Almost surely, 2^8108436721 is an apocalyptic number.

It is an amenable number.

8108436721 is a deficient number, since it is larger than the sum of its proper divisors (2440316687).

8108436721 is a wasteful number, since it uses less digits than its factorization.

8108436721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4578492.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 8108436721 is about 90046.8584737969. The cubic root of 8108436721 is about 2008.9958699125.

The spelling of 8108436721 in words is "eight billion, one hundred eight million, four hundred thirty-six thousand, seven hundred twenty-one".