21066485 has 16 divisors (see below), whose sum is σ = 29201472. Its totient is φ = 14419200.

The previous prime is 21066473. The next prime is 21066491. The reversal of 21066485 is 58466012.

It is not a de Polignac number, because 21066485 - 2⁴ = 21066469 is a prime.

It is a Duffinian number.

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 15 ways as a sum of consecutive naturals, for example, 10331 + ... + 12200.

It is an arithmetic number, because the mean of its divisors is an integer number (1825092).

Almost surely, 2^21066485 is an apocalyptic number.

It is an amenable number.

21066485 is a deficient number, since it is larger than the sum of its proper divisors (8134987).

21066485 is a wasteful number, since it uses less digits than its factorization.

21066485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22564.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 21066485 is about 4589.8240707025. The cubic root of 21066485 is about 276.1832650029.

The spelling of 21066485 in words is "twenty-one million, sixty-six thousand, four hundred eighty-five".