19421329 has 4 divisors (see below), whose sum is σ = 20091060. Its totient is φ = 18751600.

The previous prime is 19421323. The next prime is 19421341. The reversal of 19421329 is 92312491.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15421329 + 4000000 = 3927^2 + 2000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19421329 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19421329.

It is not an unprimeable number, because it can be changed into a prime (19421323) 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, 334822 + ... + 334879.

It is an arithmetic number, because the mean of its divisors is an integer number (5022765).

Almost surely, 2^19421329 is an apocalyptic number.

It is an amenable number.

19421329 is a deficient number, since it is larger than the sum of its proper divisors (669731).

19421329 is an equidigital number, since it uses as much as digits as its factorization.

19421329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 669730.

The product of its digits is 3888, while the sum is 31.

The square root of 19421329 is about 4406.9636939734. The cubic root of 19421329 is about 268.7981745982.

The spelling of 19421329 in words is "nineteen million, four hundred twenty-one thousand, three hundred twenty-nine".