21066241 has 8 divisors (see below), whose sum is σ = 24260544. Its totient is φ = 17918160.

The previous prime is 21066239. The next prime is 21066257. The reversal of 21066241 is 14266012.

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 21066241 - 2¹ = 21066239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21066271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10570 + ... + 12403.

It is an arithmetic number, because the mean of its divisors is an integer number (3032568).

Almost surely, 2^21066241 is an apocalyptic number.

It is an amenable number.

21066241 is a deficient number, since it is larger than the sum of its proper divisors (3194303).

21066241 is a wasteful number, since it uses less digits than its factorization.

21066241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23111.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 21066241 is about 4589.7974900860. The cubic root of 21066241 is about 276.1821987124.

The spelling of 21066241 in words is "twenty-one million, sixty-six thousand, two hundred forty-one".