21114309 has 16 divisors (see below), whose sum is σ = 29076992. Its totient is φ = 13618368.

The previous prime is 21114307. The next prime is 21114319. The reversal of 21114309 is 90341112.

It is not a de Polignac number, because 21114309 - 2¹ = 21114307 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21114307) 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, 24327 + ... + 25179.

It is an arithmetic number, because the mean of its divisors is an integer number (1817312).

Almost surely, 2^21114309 is an apocalyptic number.

It is an amenable number.

21114309 is a deficient number, since it is larger than the sum of its proper divisors (7962683).

21114309 is a wasteful number, since it uses less digits than its factorization.

21114309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1116.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21114309 is about 4595.0309030517. The cubic root of 21114309 is about 276.3920991806.

The spelling of 21114309 in words is "twenty-one million, one hundred fourteen thousand, three hundred nine".