21064248 has 48 divisors (see below), whose sum is σ = 58598280. Its totient is φ = 6830784.

The previous prime is 21064247. The next prime is 21064249. The reversal of 21064248 is 84246012.

21064248 is a `hidden beast` number, since 2 + 10 + 642 + 4 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (21064247) and next prime (21064249).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21064247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1290 + ... + 6617.

Almost surely, 2^21064248 is an apocalyptic number.

It is an amenable number.

21064248 is an abundant number, since it is smaller than the sum of its proper divisors (37534032).

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

21064248 is a wasteful number, since it uses less digits than its factorization.

21064248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7956 (or 7949 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 21064248 is about 4589.5803729753. The cubic root of 21064248 is about 276.1734889086.

It can be divided in two parts, 21064 and 248, that added together give a palindrome (21312).

The spelling of 21064248 in words is "twenty-one million, sixty-four thousand, two hundred forty-eight".