19203421 has 8 divisors (see below), whose sum is σ = 20490624. Its totient is φ = 17933760.

The previous prime is 19203419. The next prime is 19203439. The reversal of 19203421 is 12430291.

19203421 = 316² + 317² + ... + 446².

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19203421 - 2¹ = 19203419 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 19203392 and 19203401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19203491) 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 7 ways as a sum of consecutive naturals, for example, 2085 + ... + 6538.

It is an arithmetic number, because the mean of its divisors is an integer number (2561328).

Almost surely, 2^19203421 is an apocalyptic number.

It is an amenable number.

19203421 is a deficient number, since it is larger than the sum of its proper divisors (1287203).

19203421 is a wasteful number, since it uses less digits than its factorization.

19203421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8771.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 19203421 is about 4382.1708090854. The cubic root of 19203421 is about 267.7890827698.

The spelling of 19203421 in words is "nineteen million, two hundred three thousand, four hundred twenty-one".