19212919209 has 12 divisors (see below), whose sum is σ = 30274903152. Its totient is φ = 11644193400.

The previous prime is 19212919207. The next prime is 19212919237. The reversal of 19212919209 is 90291921291.

It is not a de Polignac number, because 19212919209 - 2¹ = 19212919207 is a prime.

It is a super-2 number, since 2×19212919209² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19212919207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97034847 + ... + 97035044.

It is an arithmetic number, because the mean of its divisors is an integer number (2522908596).

Almost surely, 2^19212919209 is an apocalyptic number.

It is an amenable number.

19212919209 is a deficient number, since it is larger than the sum of its proper divisors (11061983943).

19212919209 is a wasteful number, since it uses less digits than its factorization.

19212919209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194069908 (or 194069905 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The spelling of 19212919209 in words is "nineteen billion, two hundred twelve million, nine hundred nineteen thousand, two hundred nine".