21134272 has 56 divisors (see below), whose sum is σ = 44348400. Its totient is φ = 9977856.

The previous prime is 21134249. The next prime is 21134273. The reversal of 21134272 is 27243112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134273) 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, 109408 + ... + 109600.

Almost surely, 2^21134272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21134272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22174200).

21134272 is an abundant number, since it is smaller than the sum of its proper divisors (23214128).

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

21134272 is a wasteful number, since it uses less digits than its factorization.

21134272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 283 counting only the distinct ones).

The product of its digits is 672, while the sum is 22.

The square root of 21134272 is about 4597.2026276857. The cubic root of 21134272 is about 276.4791787920.

Adding to 21134272 its reverse (27243112), we get a palindrome (48377384).

The spelling of 21134272 in words is "twenty-one million, one hundred thirty-four thousand, two hundred seventy-two".