19093921 has 12 divisors (see below), whose sum is σ = 23986816. Its totient is φ = 14877720.

The previous prime is 19093897. The next prime is 19093927. The reversal of 19093921 is 12939091.

It is not a de Polignac number, because 19093921 - 2¹⁹ = 18569633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19093927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10425 + ... + 12118.

Almost surely, 2^19093921 is an apocalyptic number.

19093921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

19093921 is a deficient number, since it is larger than the sum of its proper divisors (4892895).

19093921 is a wasteful number, since it uses less digits than its factorization.

19093921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22572 (or 22561 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 19093921 is about 4369.6591400245. The cubic root of 19093921 is about 267.2791247450.

The spelling of 19093921 in words is "nineteen million, ninety-three thousand, nine hundred twenty-one".