21064296 has 64 divisors (see below), whose sum is σ = 58288320. Its totient is φ = 6289920.

The previous prime is 21064291. The next prime is 21064301. The reversal of 21064296 is 69246012.

It is an interprime number because it is at equal distance from previous prime (21064291) and next prime (21064301).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21064291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18726 + ... + 19818.

It is an arithmetic number, because the mean of its divisors is an integer number (910755).

Almost surely, 2^21064296 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21064296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29144160).

21064296 is an abundant number, since it is smaller than the sum of its proper divisors (37224024).

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

21064296 is a wasteful number, since it uses less digits than its factorization.

21064296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186 (or 1182 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 21064296 is about 4589.5856022085. The cubic root of 21064296 is about 276.1736986845.

The spelling of 21064296 in words is "twenty-one million, sixty-four thousand, two hundred ninety-six".