21112648 has 16 divisors (see below), whose sum is σ = 41670000. Its totient is φ = 10000656.

The previous prime is 21112639. The next prime is 21112673. The reversal of 21112648 is 84621112.

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, 69298 + ... + 69601.

It is an arithmetic number, because the mean of its divisors is an integer number (2604375).

Almost surely, 2^21112648 is an apocalyptic number.

It is an amenable number.

21112648 is a deficient number, since it is larger than the sum of its proper divisors (20557352).

21112648 is a wasteful number, since it uses less digits than its factorization.

21112648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138924 (or 138920 counting only the distinct ones).

The product of its digits is 768, while the sum is 25.

The square root of 21112648 is about 4594.8501607778. The cubic root of 21112648 is about 276.3848513419.

The spelling of 21112648 in words is "twenty-one million, one hundred twelve thousand, six hundred forty-eight".