217630142 has 16 divisors (see below), whose sum is σ = 346968960. Its totient is φ = 102085272.

The previous prime is 217630139. The next prime is 217630157. The reversal of 217630142 is 241036712.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23888 + ... + 31715.

It is an arithmetic number, because the mean of its divisors is an integer number (21685560).

Almost surely, 2^217630142 is an apocalyptic number.

217630142 is a deficient number, since it is larger than the sum of its proper divisors (129338818).

217630142 is a wasteful number, since it uses less digits than its factorization.

217630142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55727.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 217630142 is about 14752.2927709560. The cubic root of 217630142 is about 601.5056094807.

Adding to 217630142 its reverse (241036712), we get a palindrome (458666854).

The spelling of 217630142 in words is "two hundred seventeen million, six hundred thirty thousand, one hundred forty-two".