19196921 has 4 divisors (see below), whose sum is σ = 19440000. Its totient is φ = 18953844.

The previous prime is 19196917. The next prime is 19196923. The reversal of 19196921 is 12969191.

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 19196921 - 2² = 19196917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19196923) 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, 121421 + ... + 121578.

It is an arithmetic number, because the mean of its divisors is an integer number (4860000).

Almost surely, 2^19196921 is an apocalyptic number.

It is an amenable number.

19196921 is a deficient number, since it is larger than the sum of its proper divisors (243079).

19196921 is an equidigital number, since it uses as much as digits as its factorization.

19196921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243078.

The product of its digits is 8748, while the sum is 38.

The square root of 19196921 is about 4381.4291047557. The cubic root of 19196921 is about 267.7588654895.

The spelling of 19196921 in words is "nineteen million, one hundred ninety-six thousand, nine hundred twenty-one".