217222016 has 32 divisors (see below), whose sum is σ = 472090680. Its totient is φ = 98736640.

The previous prime is 217222007. The next prime is 217222021. The reversal of 217222016 is 610222712.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 217221982 and 217222000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75731 + ... + 78546.

Almost surely, 2^217222016 is an apocalyptic number.

It is an amenable number.

217222016 is an abundant number, since it is smaller than the sum of its proper divisors (254868664).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217222016 is a wasteful number, since it uses less digits than its factorization.

217222016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154302 (or 154290 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 217222016 is about 14738.4536502307. The cubic root of 217222016 is about 601.1293691713.

Adding to 217222016 its reverse (610222712), we get a palindrome (827444728).

The spelling of 217222016 in words is "two hundred seventeen million, two hundred twenty-two thousand, sixteen".