21056046 has 16 divisors (see below), whose sum is σ = 45940608. Its totient is φ = 6380600.

The previous prime is 21056039. The next prime is 21056051. The reversal of 21056046 is 64065012.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159450 + ... + 159581.

It is an arithmetic number, because the mean of its divisors is an integer number (2871288).

Almost surely, 2^21056046 is an apocalyptic number.

21056046 is an abundant number, since it is smaller than the sum of its proper divisors (24884562).

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

21056046 is a wasteful number, since it uses less digits than its factorization.

21056046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319047.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 21056046 is about 4588.6867402341. The cubic root of 21056046 is about 276.1376387638.

The spelling of 21056046 in words is "twenty-one million, fifty-six thousand, forty-six".