21414684 has 12 divisors (see below), whose sum is σ = 49967624. Its totient is φ = 7138224.

The previous prime is 21414683. The next prime is 21414689. The reversal of 21414684 is 48641412.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414683) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 892267 + ... + 892290.

Almost surely, 2^21414684 is an apocalyptic number.

It is an amenable number.

21414684 is an abundant number, since it is smaller than the sum of its proper divisors (28552940).

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

21414684 is a wasteful number, since it uses less digits than its factorization.

21414684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1784564 (or 1784562 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 21414684 is about 4627.6002420261. The cubic root of 21414684 is about 277.6965963420.

The spelling of 21414684 in words is "twenty-one million, four hundred fourteen thousand, six hundred eighty-four".