21248646 has 8 divisors (see below), whose sum is σ = 42497304. Its totient is φ = 7082880.

The previous prime is 21248641. The next prime is 21248651. The reversal of 21248646 is 64684212.

It is an interprime number because it is at equal distance from previous prime (21248641) and next prime (21248651).

It is a sphenic number, since it is the product of 3 distinct primes.

21248646 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21248641) 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, 1770715 + ... + 1770726.

It is an arithmetic number, because the mean of its divisors is an integer number (5312163).

Almost surely, 2^21248646 is an apocalyptic number.

21248646 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.

21248646 is a wasteful number, since it uses less digits than its factorization.

21248646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3541446.

The product of its digits is 18432, while the sum is 33.

The square root of 21248646 is about 4609.6253643870. The cubic root of 21248646 is about 276.9770298129.

The spelling of 21248646 in words is "twenty-one million, two hundred forty-eight thousand, six hundred forty-six".