21066701 has 8 divisors (see below), whose sum is σ = 21907200. Its totient is φ = 20236320.

The previous prime is 21066697. The next prime is 21066707. The reversal of 21066701 is 10766012.

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

It is a cyclic number.

It is not a de Polignac number, because 21066701 - 2² = 21066697 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21066707) 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, 1865 + ... + 6753.

It is an arithmetic number, because the mean of its divisors is an integer number (2738400).

Almost surely, 2^21066701 is an apocalyptic number.

It is an amenable number.

21066701 is a deficient number, since it is larger than the sum of its proper divisors (840499).

21066701 is a wasteful number, since it uses less digits than its factorization.

21066701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5059.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 21066701 is about 4589.8476009558. The cubic root of 21066701 is about 276.1842089253.

The spelling of 21066701 in words is "twenty-one million, sixty-six thousand, seven hundred one".