19004421 has 16 divisors (see below), whose sum is σ = 26154944. Its totient is φ = 12265344.

The previous prime is 19004413. The next prime is 19004429. The reversal of 19004421 is 12440091.

It is an interprime number because it is at equal distance from previous prime (19004413) and next prime (19004429).

It is not a de Polignac number, because 19004421 - 2³ = 19004413 is a prime.

It is a super-2 number, since 2×19004421² = 722336035090482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19004429) 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 15 ways as a sum of consecutive naturals, for example, 34470 + ... + 35016.

It is an arithmetic number, because the mean of its divisors is an integer number (1634684).

Almost surely, 2^19004421 is an apocalyptic number.

It is an amenable number.

19004421 is a deficient number, since it is larger than the sum of its proper divisors (7150523).

19004421 is a wasteful number, since it uses less digits than its factorization.

19004421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 19004421 is about 4359.4060375239. The cubic root of 19004421 is about 266.8608597649.

The spelling of 19004421 in words is "nineteen million, four thousand, four hundred twenty-one".