21434203 has 8 divisors (see below), whose sum is σ = 24588800. Its totient is φ = 18302760.

The previous prime is 21434177. The next prime is 21434213. The reversal of 21434203 is 30243412.

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

It is not a de Polignac number, because 21434203 - 2¹⁷ = 21303131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21434213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3753 + ... + 7546.

It is an arithmetic number, because the mean of its divisors is an integer number (3073600).

Almost surely, 2^21434203 is an apocalyptic number.

21434203 is a deficient number, since it is larger than the sum of its proper divisors (3154597).

21434203 is a wasteful number, since it uses less digits than its factorization.

21434203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11577.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 21434203 is about 4629.7087381389. The cubic root of 21434203 is about 277.7809421091.

Adding to 21434203 its reverse (30243412), we get a palindrome (51677615).

The spelling of 21434203 in words is "twenty-one million, four hundred thirty-four thousand, two hundred three".