2099721431 has 2 divisors, whose sum is σ = 2099721432. Its totient is φ = 2099721430.

The previous prime is 2099721383. The next prime is 2099721499. The reversal of 2099721431 is 1341279902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2099721431 - 2¹⁰ = 2099720407 is a prime.

It is a super-3 number, since 3×2099721431³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2099720431) 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, 1049860715 + 1049860716.

It is an arithmetic number, because the mean of its divisors is an integer number (1049860716).

Almost surely, 2^2099721431 is an apocalyptic number.

2099721431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2099721431 is an equidigital number, since it uses as much as digits as its factorization.

2099721431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 2099721431 is about 45822.7174117817. The cubic root of 2099721431 is about 1280.5225387284.

The spelling of 2099721431 in words is "two billion, ninety-nine million, seven hundred twenty-one thousand, four hundred thirty-one".