21000532 has 12 divisors (see below), whose sum is σ = 42001120. Its totient is φ = 9000216.

The previous prime is 21000527. The next prime is 21000533. The reversal of 21000532 is 23500012.

21000532 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000533) 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, 374982 + ... + 375037.

Almost surely, 2^21000532 is an apocalyptic number.

It is an amenable number.

21000532 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21000532 is a wasteful number, since it uses less digits than its factorization.

21000532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750030 (or 750028 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 21000532 is about 4582.6337405470. The cubic root of 21000532 is about 275.8947473766.

Adding to 21000532 its reverse (23500012), we get a palindrome (44500544).

The spelling of 21000532 in words is "twenty-one million, five hundred thirty-two", and thus it is an aban number.