21134203 has 4 divisors (see below), whose sum is σ = 21155400. Its totient is φ = 21113008.

The previous prime is 21134173. The next prime is 21134221. The reversal of 21134203 is 30243112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21134203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21134273) 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, 9025 + ... + 11122.

It is an arithmetic number, because the mean of its divisors is an integer number (5288850).

Almost surely, 2^21134203 is an apocalyptic number.

21134203 is a deficient number, since it is larger than the sum of its proper divisors (21197).

21134203 is a wasteful number, since it uses less digits than its factorization.

21134203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21196.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 21134203 is about 4597.1951231158. The cubic root of 21134203 is about 276.4788779050.

Adding to 21134203 its reverse (30243112), we get a palindrome (51377315).

The spelling of 21134203 in words is "twenty-one million, one hundred thirty-four thousand, two hundred three".