21416717 has 8 divisors (see below), whose sum is σ = 24938496. Its totient is φ = 18010512.

The previous prime is 21416713. The next prime is 21416729. The reversal of 21416717 is 71761412.

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 21416717 - 2² = 21416713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21416717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21416713) 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, 28493 + ... + 29234.

It is an arithmetic number, because the mean of its divisors is an integer number (3117312).

Almost surely, 2^21416717 is an apocalyptic number.

It is an amenable number.

21416717 is a deficient number, since it is larger than the sum of its proper divisors (3521779).

21416717 is an equidigital number, since it uses as much as digits as its factorization.

21416717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57787.

The product of its digits is 2352, while the sum is 29.

The square root of 21416717 is about 4627.8198971006. The cubic root of 21416717 is about 277.7053837596.

The spelling of 21416717 in words is "twenty-one million, four hundred sixteen thousand, seven hundred seventeen".