21714209 has 8 divisors (see below), whose sum is σ = 23732352. Its totient is φ = 19703440.

The previous prime is 21714197. The next prime is 21714223. The reversal of 21714209 is 90241712.

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 21714209 - 2¹² = 21710113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21714239) 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 7 ways as a sum of consecutive naturals, for example, 5672 + ... + 8694.

It is an arithmetic number, because the mean of its divisors is an integer number (2966544).

Almost surely, 2^21714209 is an apocalyptic number.

It is an amenable number.

21714209 is a deficient number, since it is larger than the sum of its proper divisors (2018143).

21714209 is a wasteful number, since it uses less digits than its factorization.

21714209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3687.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 21714209 is about 4659.8507486828. The cubic root of 21714209 is about 278.9853111660.

The spelling of 21714209 in words is "twenty-one million, seven hundred fourteen thousand, two hundred nine".