21434232 has 16 divisors (see below), whose sum is σ = 53585640. Its totient is φ = 7144736.

The previous prime is 21434227. The next prime is 21434233. The reversal of 21434232 is 23243412.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21434199 and 21434208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434233) 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 3 ways as a sum of consecutive naturals, for example, 446523 + ... + 446570.

Almost surely, 2^21434232 is an apocalyptic number.

It is an amenable number.

21434232 is an abundant number, since it is smaller than the sum of its proper divisors (32151408).

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

21434232 is a wasteful number, since it uses less digits than its factorization.

21434232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893102 (or 893098 counting only the distinct ones).

The product of its digits is 1152, while the sum is 21.

The square root of 21434232 is about 4629.7118700844. The cubic root of 21434232 is about 277.7810673862.

Adding to 21434232 its reverse (23243412), we get a palindrome (44677644).

The spelling of 21434232 in words is "twenty-one million, four hundred thirty-four thousand, two hundred thirty-two".