217142 has 4 divisors (see below), whose sum is σ = 325716. Its totient is φ = 108570.

The previous prime is 217121. The next prime is 217157. The reversal of 217142 is 241712.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 217142.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 217142.

It is an unprimeable number.

217142 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54284 + ... + 54287.

It is an arithmetic number, because the mean of its divisors is an integer number (81429).

2²¹⁷¹⁴² is an apocalyptic number.

217142 is a deficient number, since it is larger than the sum of its proper divisors (108574).

217142 is a wasteful number, since it uses less digits than its factorization.

217142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108573.

The product of its digits is 112, while the sum is 17.

The square root of 217142 is about 465.9849782987. The cubic root of 217142 is about 60.1055549344.

Adding to 217142 its reverse (241712), we get a palindrome (458854).

The spelling of 217142 in words is "two hundred seventeen thousand, one hundred forty-two", and thus it is an iban number.