21248012 has 12 divisors (see below), whose sum is σ = 37220400. Its totient is φ = 10613616.

The previous prime is 21248009. The next prime is 21248047. The reversal of 21248012 is 21084212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3698 + ... + 7494.

It is an arithmetic number, because the mean of its divisors is an integer number (3101700).

Almost surely, 2^21248012 is an apocalyptic number.

It is an amenable number.

21248012 is a deficient number, since it is larger than the sum of its proper divisors (15972388).

21248012 is a wasteful number, since it uses less digits than its factorization.

21248012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5200 (or 5198 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 21248012 is about 4609.5565947280. The cubic root of 21248012 is about 276.9742750463.

The spelling of 21248012 in words is "twenty-one million, two hundred forty-eight thousand, twelve".