21414009 has 16 divisors (see below), whose sum is σ = 29624192. Its totient is φ = 13747968.

The previous prime is 21413993. The next prime is 21414037. The reversal of 21414009 is 90041412.

It is not a de Polignac number, because 21414009 - 2⁴ = 21413993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21414049) 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 15 ways as a sum of consecutive naturals, for example, 10497 + ... + 12369.

It is an arithmetic number, because the mean of its divisors is an integer number (1851512).

Almost surely, 2^21414009 is an apocalyptic number.

It is an amenable number.

21414009 is a deficient number, since it is larger than the sum of its proper divisors (8210183).

21414009 is a wasteful number, since it uses less digits than its factorization.

21414009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21414009 is about 4627.5273094818. The cubic root of 21414009 is about 277.6936786061.

The spelling of 21414009 in words is "twenty-one million, four hundred fourteen thousand, nine".