2143219809 has 4 divisors (see below), whose sum is σ = 2857626416. Its totient is φ = 1428813204.

The previous prime is 2143219759. The next prime is 2143219823. The reversal of 2143219809 is 9089123412.

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 not a de Polignac number, because 2143219809 - 2⁹ = 2143219297 is a prime.

It is a super-2 number, since 2×2143219809² = 9186782299379992962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2143219909) 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, 357203299 + ... + 357203304.

It is an arithmetic number, because the mean of its divisors is an integer number (714406604).

Almost surely, 2^2143219809 is an apocalyptic number.

It is an amenable number.

2143219809 is a deficient number, since it is larger than the sum of its proper divisors (714406607).

2143219809 is an equidigital number, since it uses as much as digits as its factorization.

2143219809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714406606.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 2143219809 is about 46294.9220649522. The cubic root of 2143219809 is about 1289.3047169654.

The spelling of 2143219809 in words is "two billion, one hundred forty-three million, two hundred nineteen thousand, eight hundred nine".