21226648 has 32 divisors (see below), whose sum is σ = 42490800. Its totient is φ = 9911808.

The previous prime is 21226633. The next prime is 21226663. The reversal of 21226648 is 84662212.

It is an interprime number because it is at equal distance from previous prime (21226633) and next prime (21226663).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10140 + ... + 12052.

Almost surely, 2^21226648 is an apocalyptic number.

It is an amenable number.

21226648 is an abundant number, since it is smaller than the sum of its proper divisors (21264152).

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

21226648 is a wasteful number, since it uses less digits than its factorization.

21226648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2011 (or 2007 counting only the distinct ones).

The product of its digits is 9216, while the sum is 31.

The square root of 21226648 is about 4607.2386523817. The cubic root of 21226648 is about 276.8814151792.

The spelling of 21226648 in words is "twenty-one million, two hundred twenty-six thousand, six hundred forty-eight".