21073785 has 8 divisors (see below), whose sum is σ = 33718080. Its totient is φ = 11239344.

The previous prime is 21073739. The next prime is 21073799. The reversal of 21073785 is 58737012.

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

It is not a de Polignac number, because 21073785 - 2⁶ = 21073721 is a prime.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 702445 + ... + 702474.

It is an arithmetic number, because the mean of its divisors is an integer number (4214760).

Almost surely, 2^21073785 is an apocalyptic number.

It is an amenable number.

21073785 is a deficient number, since it is larger than the sum of its proper divisors (12644295).

21073785 is a wasteful number, since it uses less digits than its factorization.

21073785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1404927.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 21073785 is about 4590.6192392748. The cubic root of 21073785 is about 276.2151625090.

The spelling of 21073785 in words is "twenty-one million, seventy-three thousand, seven hundred eighty-five".