21814709 has 8 divisors (see below), whose sum is σ = 25081728. Its totient is φ = 18585360.

The previous prime is 21814703. The next prime is 21814711. The reversal of 21814709 is 90741812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21814709 - 2²⁰ = 20766133 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21814703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8162 + ... + 10499.

It is an arithmetic number, because the mean of its divisors is an integer number (3135216).

Almost surely, 2^21814709 is an apocalyptic number.

It is an amenable number.

21814709 is a deficient number, since it is larger than the sum of its proper divisors (3267019).

21814709 is a wasteful number, since it uses less digits than its factorization.

21814709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18835.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 21814709 is about 4670.6219071982. The cubic root of 21814709 is about 279.4150586257.

The spelling of 21814709 in words is "twenty-one million, eight hundred fourteen thousand, seven hundred nine".