21134230 has 64 divisors (see below), whose sum is σ = 44307648. Its totient is φ = 7188480.

The previous prime is 21134221. The next prime is 21134231. The reversal of 21134230 is 3243112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161265 + ... + 161395.

It is an arithmetic number, because the mean of its divisors is an integer number (692307).

Almost surely, 2^21134230 is an apocalyptic number.

21134230 is an abundant number, since it is smaller than the sum of its proper divisors (23173418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21134230 is a wasteful number, since it uses less digits than its factorization.

21134230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241.

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

The square root of 21134230 is about 4597.1980596881. The cubic root of 21134230 is about 276.4789956435.

Adding to 21134230 its reverse (3243112), we get a palindrome (24377342).

The spelling of 21134230 in words is "twenty-one million, one hundred thirty-four thousand, two hundred thirty".