21300032 has 28 divisors (see below), whose sum is σ = 45520356. Its totient is φ = 9830400.

The previous prime is 21300029. The next prime is 21300061. The reversal of 21300032 is 23000312.

It can be written as a sum of positive squares in 2 ways, for example, as 14622976 + 6677056 = 3824^2 + 2584^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21299986 and 21300022.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11969 + ... + 13632.

It is an arithmetic number, because the mean of its divisors is an integer number (1625727).

Almost surely, 2^21300032 is an apocalyptic number.

It is an amenable number.

21300032 is an abundant number, since it is smaller than the sum of its proper divisors (24220324).

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

21300032 is a wasteful number, since it uses less digits than its factorization.

21300032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25626 (or 25616 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 11.

The square root of 21300032 is about 4615.1957704955. The cubic root of 21300032 is about 277.2001229917.

Adding to 21300032 its reverse (23000312), we get a palindrome (44300344).

The spelling of 21300032 in words is "twenty-one million, three hundred thousand, thirty-two".