21051832 has 32 divisors (see below), whose sum is σ = 40510800. Its totient is φ = 10252800.

The previous prime is 21051809. The next prime is 21051839. The reversal of 21051832 is 23815012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051839) 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, 87232 + ... + 87472.

Almost surely, 2^21051832 is an apocalyptic number.

It is an amenable number.

21051832 is a deficient number, since it is larger than the sum of its proper divisors (19458968).

21051832 is a wasteful number, since it uses less digits than its factorization.

21051832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 21051832 is about 4588.2275444882. The cubic root of 21051832 is about 276.1192161589.

Adding to 21051832 its reverse (23815012), we get a palindrome (44866844).

The spelling of 21051832 in words is "twenty-one million, fifty-one thousand, eight hundred thirty-two".