21024912 has 40 divisors (see below), whose sum is σ = 54478656. Its totient is φ = 6987136.

The previous prime is 21024911. The next prime is 21024953. The reversal of 21024912 is 21942012.

It is not an unprimeable number, because it can be changed into a prime (21024911) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 30718 + ... + 31394.

Almost surely, 2^21024912 is an apocalyptic number.

It is an amenable number.

21024912 is an abundant number, since it is smaller than the sum of its proper divisors (33453744).

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

21024912 is a wasteful number, since it uses less digits than its factorization.

21024912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335 (or 1329 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21024912 is about 4585.2930113571. The cubic root of 21024912 is about 276.0014702715.

Adding to 21024912 its reverse (21942012), we get a palindrome (42966924).

The spelling of 21024912 in words is "twenty-one million, twenty-four thousand, nine hundred twelve".