21064282 has 8 divisors (see below), whose sum is σ = 31640436. Its totient is φ = 10517472.

The previous prime is 21064273. The next prime is 21064291. The reversal of 21064282 is 28246012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21064273) and next prime (21064291).

It can be written as a sum of positive squares in 2 ways, for example, as 20693401 + 370881 = 4549^2 + 609^2 .

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

It is a zygodrome in base 4.

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 3 ways as a sum of consecutive naturals, for example, 5443 + ... + 8470.

Almost surely, 2^21064282 is an apocalyptic number.

21064282 is a deficient number, since it is larger than the sum of its proper divisors (10576154).

21064282 is a wasteful number, since it uses less digits than its factorization.

21064282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14672.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 21064282 is about 4589.5840770161. The cubic root of 21064282 is about 276.1736374999.

The spelling of 21064282 in words is "twenty-one million, sixty-four thousand, two hundred eighty-two".