21020032 has 32 divisors (see below), whose sum is σ = 45685800. Its totient is φ = 9553920.

The previous prime is 21020029. The next prime is 21020039. The reversal of 21020032 is 23002012.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020039) 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, 6057 + ... + 8872.

Almost surely, 2^21020032 is an apocalyptic number.

21020032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21020032 is an abundant number, since it is smaller than the sum of its proper divisors (24665768).

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

21020032 is a wasteful number, since it uses less digits than its factorization.

21020032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14954 (or 14942 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 21020032 is about 4584.7608443625. The cubic root of 21020032 is about 275.9801147894.

Adding to 21020032 its reverse (23002012), we get a palindrome (44022044).

The spelling of 21020032 in words is "twenty-one million, twenty thousand, thirty-two".