102210217 has 4 divisors (see below), whose sum is σ = 102254596. Its totient is φ = 102165840.

The previous prime is 102210211. The next prime is 102210221. The reversal of 102210217 is 712012201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 712012201 = 37 ⋅19243573.

It can be written as a sum of positive squares in 2 ways, for example, as 45373696 + 56836521 = 6736^2 + 7539^2 .

It is a cyclic number.

It is not a de Polignac number, because 102210217 - 2³ = 102210209 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 102210217.

It is not an unprimeable number, because it can be changed into a prime (102210211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18534 + ... + 23407.

It is an arithmetic number, because the mean of its divisors is an integer number (25563649).

Almost surely, 2^102210217 is an apocalyptic number.

It is an amenable number.

102210217 is a deficient number, since it is larger than the sum of its proper divisors (44379).

102210217 is an equidigital number, since it uses as much as digits as its factorization.

102210217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44378.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 102210217 is about 10109.9068739529. The cubic root of 102210217 is about 467.5536339278.

Adding to 102210217 its reverse (712012201), we get a palindrome (814222418).

The spelling of 102210217 in words is "one hundred two million, two hundred ten thousand, two hundred seventeen".