21055334 has 16 divisors (see below), whose sum is σ = 33138720. Its totient is φ = 10019520.

The previous prime is 21055319. The next prime is 21055343. The reversal of 21055334 is 43355012.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 1562 + ... + 6674.

It is an arithmetic number, because the mean of its divisors is an integer number (2071170).

Almost surely, 2^21055334 is an apocalyptic number.

21055334 is a deficient number, since it is larger than the sum of its proper divisors (12083386).

21055334 is a wasteful number, since it uses less digits than its factorization.

21055334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5215.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 21055334 is about 4588.6091574681. The cubic root of 21055334 is about 276.1345262418.

The spelling of 21055334 in words is "twenty-one million, fifty-five thousand, three hundred thirty-four".