21134432 has 24 divisors (see below), whose sum is σ = 45391752. Its totient is φ = 9606400.

The previous prime is 21134431. The next prime is 21134453. The reversal of 21134432 is 23443112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21134431) 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, 29669 + ... + 30372.

It is an arithmetic number, because the mean of its divisors is an integer number (1891323).

Almost surely, 2^21134432 is an apocalyptic number.

21134432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21134432 is an abundant number, since it is smaller than the sum of its proper divisors (24257320).

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

21134432 is a wasteful number, since it uses less digits than its factorization.

21134432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60062 (or 60054 counting only the distinct ones).

The product of its digits is 576, while the sum is 20.

The square root of 21134432 is about 4597.2200295396. The cubic root of 21134432 is about 276.4798764985.

Adding to 21134432 its reverse (23443112), we get a palindrome (44577544).

It can be divided in two parts, 211 and 34432, that added together give a palindrome (34643).

The spelling of 21134432 in words is "twenty-one million, one hundred thirty-four thousand, four hundred thirty-two".