21056466 has 8 divisors (see below), whose sum is σ = 42112944. Its totient is φ = 7018820.

The previous prime is 21056459. The next prime is 21056479. The reversal of 21056466 is 66465012.

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

21056466 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1754700 + ... + 1754711.

It is an arithmetic number, because the mean of its divisors is an integer number (5264118).

Almost surely, 2^21056466 is an apocalyptic number.

21056466 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21056466 is a wasteful number, since it uses less digits than its factorization.

21056466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3509416.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 21056466 is about 4588.7325047337. The cubic root of 21056466 is about 276.1394747691.

The spelling of 21056466 in words is "twenty-one million, fifty-six thousand, four hundred sixty-six".