21085366 has 8 divisors (see below), whose sum is σ = 31941504. Its totient is φ = 10438200.

The previous prime is 21085343. The next prime is 21085373. The reversal of 21085366 is 66358012.

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

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 51990 + ... + 52393.

It is an arithmetic number, because the mean of its divisors is an integer number (3992688).

Almost surely, 2^21085366 is an apocalyptic number.

21085366 is a deficient number, since it is larger than the sum of its proper divisors (10856138).

21085366 is a wasteful number, since it uses less digits than its factorization.

21085366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104486.

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

The square root of 21085366 is about 4591.8804426945. The cubic root of 21085366 is about 276.2657508269.

The spelling of 21085366 in words is "twenty-one million, eighty-five thousand, three hundred sixty-six".