21033732 has 12 divisors (see below), whose sum is σ = 49078736. Its totient is φ = 7011240.

The previous prime is 21033721. The next prime is 21033737. The reversal of 21033732 is 23733012.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 21033699 and 21033708.

It is not an unprimeable number, because it can be changed into a prime (21033737) 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, 876394 + ... + 876417.

Almost surely, 2^21033732 is an apocalyptic number.

It is an amenable number.

21033732 is an abundant number, since it is smaller than the sum of its proper divisors (28045004).

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

21033732 is a wasteful number, since it uses less digits than its factorization.

21033732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752818 (or 1752816 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 21.

The square root of 21033732 is about 4586.2546811096. The cubic root of 21033732 is about 276.0400592978.

Adding to 21033732 its reverse (23733012), we get a palindrome (44766744).

The spelling of 21033732 in words is "twenty-one million, thirty-three thousand, seven hundred thirty-two".