2109219091 has 8 divisors (see below), whose sum is σ = 2414361344. Its totient is φ = 1805033160.

The previous prime is 2109219059. The next prime is 2109219191. The reversal of 2109219091 is 1909129012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2109219091 - 2⁵ = 2109219059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2109219001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234345 + ... + 243178.

It is an arithmetic number, because the mean of its divisors is an integer number (301795168).

Almost surely, 2^2109219091 is an apocalyptic number.

2109219091 is a deficient number, since it is larger than the sum of its proper divisors (305142253).

2109219091 is an equidigital number, since it uses as much as digits as its factorization.

2109219091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478161.

The product of its (nonzero) digits is 2916, while the sum is 34.

The square root of 2109219091 is about 45926.2353236143. The cubic root of 2109219091 is about 1282.4503621161.

The spelling of 2109219091 in words is "two billion, one hundred nine million, two hundred nineteen thousand, ninety-one".