2099390217 has 4 divisors (see below), whose sum is σ = 2799186960. Its totient is φ = 1399593476.

The previous prime is 2099390207. The next prime is 2099390239. The reversal of 2099390217 is 7120939902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2099390217 - 2⁴ = 2099390201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2099390207) 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, 349898367 + ... + 349898372.

It is an arithmetic number, because the mean of its divisors is an integer number (699796740).

Almost surely, 2^2099390217 is an apocalyptic number.

It is an amenable number.

2099390217 is a deficient number, since it is larger than the sum of its proper divisors (699796743).

2099390217 is an equidigital number, since it uses as much as digits as its factorization.

2099390217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 699796742.

The product of its (nonzero) digits is 61236, while the sum is 42.

The square root of 2099390217 is about 45819.1031885173. The cubic root of 2099390217 is about 1280.4552045115.

The spelling of 2099390217 in words is "two billion, ninety-nine million, three hundred ninety thousand, two hundred seventeen".