21416217 has 8 divisors (see below), whose sum is σ = 28747200. Its totient is φ = 14181360.

The previous prime is 21416183. The next prime is 21416281. The reversal of 21416217 is 71261412.

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

It is not a de Polignac number, because 21416217 - 2⁷ = 21416089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21416117) 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, 23509 + ... + 24402.

It is an arithmetic number, because the mean of its divisors is an integer number (3593400).

Almost surely, 2^21416217 is an apocalyptic number.

It is an amenable number.

21416217 is a deficient number, since it is larger than the sum of its proper divisors (7330983).

21416217 is a wasteful number, since it uses less digits than its factorization.

21416217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48063.

The product of its digits is 672, while the sum is 24.

The square root of 21416217 is about 4627.7658756683. The cubic root of 21416217 is about 277.7032226165.

Adding to 21416217 its reverse (71261412), we get a palindrome (92677629).

The spelling of 21416217 in words is "twenty-one million, four hundred sixteen thousand, two hundred seventeen".