21055446 has 12 divisors (see below), whose sum is σ = 45620172. Its totient is φ = 7018476.

The previous prime is 21055429. The next prime is 21055451. The reversal of 21055446 is 64455012.

21055446 is a `hidden beast` number, since 210 + 5 + 5 + 446 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 584856 + ... + 584891.

It is an arithmetic number, because the mean of its divisors is an integer number (3801681).

Almost surely, 2^21055446 is an apocalyptic number.

21055446 is an abundant number, since it is smaller than the sum of its proper divisors (24564726).

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

21055446 is a wasteful number, since it uses less digits than its factorization.

21055446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169755 (or 1169752 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 21055446 is about 4588.6213615856. The cubic root of 21055446 is about 276.1350158567.

The spelling of 21055446 in words is "twenty-one million, fifty-five thousand, four hundred forty-six".