21084044 has 12 divisors (see below), whose sum is σ = 38169600. Its totient is φ = 10178448.

The previous prime is 21083989. The next prime is 21084047. The reversal of 21084044 is 44048012.

It is a super-2 number, since 2×21084044² = 889073822787872, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21084047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90764 + ... + 90995.

It is an arithmetic number, because the mean of its divisors is an integer number (3180800).

Almost surely, 2^21084044 is an apocalyptic number.

It is an amenable number.

21084044 is a deficient number, since it is larger than the sum of its proper divisors (17085556).

21084044 is a wasteful number, since it uses less digits than its factorization.

21084044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181792 (or 181790 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 21084044 is about 4591.7364906972. The cubic root of 21084044 is about 276.2599769811.

The spelling of 21084044 in words is "twenty-one million, eighty-four thousand, forty-four".