21075446 has 16 divisors (see below), whose sum is σ = 38031360. Its totient is φ = 8556840.

The previous prime is 21075437. The next prime is 21075451. The reversal of 21075446 is 64457012.

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 7 ways as a sum of consecutive naturals, for example, 39350 + ... + 39881.

It is an arithmetic number, because the mean of its divisors is an integer number (2376960).

Almost surely, 2^21075446 is an apocalyptic number.

21075446 is a deficient number, since it is larger than the sum of its proper divisors (16955914).

21075446 is a wasteful number, since it uses less digits than its factorization.

21075446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79259.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 21075446 is about 4590.8001481223. The cubic root of 21075446 is about 276.2224192553. Note that the first 3 decimals are identical.

The spelling of 21075446 in words is "twenty-one million, seventy-five thousand, four hundred forty-six".