19221031209 has 4 divisors (see below), whose sum is σ = 25628041616. Its totient is φ = 12814020804.

The previous prime is 19221031189. The next prime is 19221031259. The reversal of 19221031209 is 90213012291.

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 19221031209 - 2¹⁵ = 19220998441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19221031259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3203505199 + ... + 3203505204.

It is an arithmetic number, because the mean of its divisors is an integer number (6407010404).

Almost surely, 2^19221031209 is an apocalyptic number.

It is an amenable number.

19221031209 is a deficient number, since it is larger than the sum of its proper divisors (6407010407).

19221031209 is an equidigital number, since it uses as much as digits as its factorization.

19221031209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6407010406.

The product of its (nonzero) digits is 1944, while the sum is 30.

The spelling of 19221031209 in words is "nineteen billion, two hundred twenty-one million, thirty-one thousand, two hundred nine".