21064411 has 8 divisors (see below), whose sum is σ = 23073120. Its totient is φ = 19141248.

The previous prime is 21064363. The next prime is 21064471. The reversal of 21064411 is 11446012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21064411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21064471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20871 + ... + 21856.

It is an arithmetic number, because the mean of its divisors is an integer number (2884140).

Almost surely, 2^21064411 is an apocalyptic number.

21064411 is a deficient number, since it is larger than the sum of its proper divisors (2008709).

21064411 is a wasteful number, since it uses less digits than its factorization.

21064411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42773.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 21064411 is about 4589.5981305557. The cubic root of 21064411 is about 276.1742012714.

The spelling of 21064411 in words is "twenty-one million, sixty-four thousand, four hundred eleven".