16212217 has 16 divisors (see below), whose sum is σ = 19544832. Its totient is φ = 13147200.

The previous prime is 16212199. The next prime is 16212233. The reversal of 16212217 is 71221261.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 16212217 - 2²³ = 7823609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16212257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15763 + ... + 16759.

It is an arithmetic number, because the mean of its divisors is an integer number (1221552).

Almost surely, 2^16212217 is an apocalyptic number.

It is an amenable number.

16212217 is a deficient number, since it is larger than the sum of its proper divisors (3332615).

16212217 is a wasteful number, since it uses less digits than its factorization.

16212217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128.

The product of its digits is 336, while the sum is 22.

The square root of 16212217 is about 4026.4397425021. The cubic root of 16212217 is about 253.0933898850.

Adding to 16212217 its reverse (71221261), we get a palindrome (87433478).

The spelling of 16212217 in words is "sixteen million, two hundred twelve thousand, two hundred seventeen".