21353432 has 16 divisors (see below), whose sum is σ = 40116600. Its totient is φ = 10655680.

The previous prime is 21353419. The next prime is 21353441. The reversal of 21353432 is 23435312.

It is a junction number, because it is equal to n+sod(n) for n = 21353398 and 21353407.

It is a congruent number.

It is an unprimeable number.

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, 2207 + ... + 6897.

Almost surely, 2^21353432 is an apocalyptic number.

It is an amenable number.

21353432 is a deficient number, since it is larger than the sum of its proper divisors (18763168).

21353432 is a wasteful number, since it uses less digits than its factorization.

21353432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5266 (or 5262 counting only the distinct ones).

The product of its digits is 2160, while the sum is 23.

The square root of 21353432 is about 4620.9773857919. The cubic root of 21353432 is about 277.4315801343.

Adding to 21353432 its reverse (23435312), we get a palindrome (44788744).

The spelling of 21353432 in words is "twenty-one million, three hundred fifty-three thousand, four hundred thirty-two".