21094447 has 8 divisors (see below), whose sum is σ = 23402880. Its totient is φ = 18851160.

The previous prime is 21094421. The next prime is 21094457. The reversal of 21094447 is 74449012.

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 21094447 - 2¹¹ = 21092399 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 (21094417) 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, 15603 + ... + 16900.

It is an arithmetic number, because the mean of its divisors is an integer number (2925360).

Almost surely, 2^21094447 is an apocalyptic number.

21094447 is a deficient number, since it is larger than the sum of its proper divisors (2308433).

21094447 is a wasteful number, since it uses less digits than its factorization.

21094447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32573.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 21094447 is about 4592.8691468406. The cubic root of 21094447 is about 276.3054056474.

It can be divided in two parts, 2109 and 4447, that added together give a palindrome (6556).

The spelling of 21094447 in words is "twenty-one million, ninety-four thousand, four hundred forty-seven".