2099326721 has 4 divisors (see below), whose sum is σ = 2099493444. Its totient is φ = 2099160000.

The previous prime is 2099326717. The next prime is 2099326763. The reversal of 2099326721 is 1276239902.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 215766721 + 1883560000 = 14689^2 + 43400^2 .

It is a cyclic number.

It is not a de Polignac number, because 2099326721 - 2² = 2099326717 is a prime.

It is a super-2 number, since 2×2099326721² = 8814345363009223682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2099326711) 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, 62780 + ... + 90221.

It is an arithmetic number, because the mean of its divisors is an integer number (524873361).

Almost surely, 2^2099326721 is an apocalyptic number.

It is an amenable number.

2099326721 is a deficient number, since it is larger than the sum of its proper divisors (166723).

2099326721 is a wasteful number, since it uses less digits than its factorization.

2099326721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166722.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 2099326721 is about 45818.4102845134. The cubic root of 2099326721 is about 1280.4422952704.

The spelling of 2099326721 in words is "two billion, ninety-nine million, three hundred twenty-six thousand, seven hundred twenty-one".