21066835 has 8 divisors (see below), whose sum is σ = 25709040. Its totient is φ = 16567584.

The previous prime is 21066833. The next prime is 21066841. The reversal of 21066835 is 53866012.

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 21066835 - 2¹ = 21066833 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21066797 and 21066806.

It is not an unprimeable number, because it can be changed into a prime (21066833) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 35412 + ... + 36001.

It is an arithmetic number, because the mean of its divisors is an integer number (3213630).

Almost surely, 2^21066835 is an apocalyptic number.

21066835 is a deficient number, since it is larger than the sum of its proper divisors (4642205).

21066835 is an equidigital number, since it uses as much as digits as its factorization.

21066835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71477.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 21066835 is about 4589.8621983672. The cubic root of 21066835 is about 276.1847945036.

The spelling of 21066835 in words is "twenty-one million, sixty-six thousand, eight hundred thirty-five".