21084602 has 24 divisors (see below), whose sum is σ = 40137120. Its totient is φ = 8214360.

The previous prime is 21084601. The next prime is 21084611. The reversal of 21084602 is 20648012.

It is not an unprimeable number, because it can be changed into a prime (21084601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8702 + ... + 10857.

It is an arithmetic number, because the mean of its divisors is an integer number (1672380).

Almost surely, 2^21084602 is an apocalyptic number.

21084602 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21084602 is a deficient number, since it is larger than the sum of its proper divisors (19052518).

21084602 is a wasteful number, since it uses less digits than its factorization.

21084602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19586 (or 19579 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21084602 is about 4591.7972516216. The cubic root of 21084602 is about 276.2624140801.

The spelling of 21084602 in words is "twenty-one million, eighty-four thousand, six hundred two".