21233532 has 24 divisors (see below), whose sum is σ = 49620816. Its totient is φ = 7067008.

The previous prime is 21233503. The next prime is 21233579. The reversal of 21233532 is 23533212.

It is a junction number, because it is equal to n+sod(n) for n = 21233499 and 21233508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12358 + ... + 13970.

It is an arithmetic number, because the mean of its divisors is an integer number (2067534).

Almost surely, 2^21233532 is an apocalyptic number.

It is an amenable number.

21233532 is an abundant number, since it is smaller than the sum of its proper divisors (28387284).

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

21233532 is a wasteful number, since it uses less digits than its factorization.

21233532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2717 (or 2715 counting only the distinct ones).

The product of its digits is 1080, while the sum is 21.

The square root of 21233532 is about 4607.9856770611. The cubic root of 21233532 is about 276.9113436862.

Adding to 21233532 its reverse (23533212), we get a palindrome (44766744).

The spelling of 21233532 in words is "twenty-one million, two hundred thirty-three thousand, five hundred thirty-two".