21804714 has 20 divisors (see below), whose sum is σ = 48859074. Its totient is φ = 7268184.

The previous prime is 21804701. The next prime is 21804719. The reversal of 21804714 is 41740812.

It can be written as a sum of positive squares in only one way, i.e., 21483225 + 321489 = 4635^2 + 567^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21804719) 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 9 ways as a sum of consecutive naturals, for example, 67137 + ... + 67460.

Almost surely, 2^21804714 is an apocalyptic number.

21804714 is an abundant number, since it is smaller than the sum of its proper divisors (27054360).

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

21804714 is a wasteful number, since it uses less digits than its factorization.

21804714 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134611 (or 134602 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 21804714 is about 4669.5517986205. The cubic root of 21804714 is about 279.3723782466.

The spelling of 21804714 in words is "twenty-one million, eight hundred four thousand, seven hundred fourteen".