8999721122 has 50 divisors (see below), whose sum is σ = 16186035063. Its totient is φ = 3752779464.

The previous prime is 8999721079. The next prime is 8999721139. The reversal of 8999721122 is 2211279998.

It can be written as a sum of positive squares in 3 ways, for example, as 8860268641 + 139452481 = 94129^2 + 11809^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=67081.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 24 ways as a sum of consecutive naturals, for example, 243235688 + ... + 243235724.

Almost surely, 2^8999721122 is an apocalyptic number.

8999721122 is a deficient number, since it is larger than the sum of its proper divisors (7186313941).

8999721122 is an frugal number, since it uses more digits than its factorization.

8999721122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 46 counting only the distinct ones).

The product of its digits is 326592, while the sum is 50.

The square root of 8999721122 is about 94866.8599775496. The cubic root of 8999721122 is about 2080.0623380294.

Multiplying 8999721122 by its sum of digits (50), we get a square (449986056100 = 670810²).

The spelling of 8999721122 in words is "eight billion, nine hundred ninety-nine million, seven hundred twenty-one thousand, one hundred twenty-two".