217131142 has 16 divisors (see below), whose sum is σ = 332307360. Its totient is φ = 106367872.

The previous prime is 217131097. The next prime is 217131143. The reversal of 217131142 is 241131712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217131143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139038 + ... + 140590.

It is an arithmetic number, because the mean of its divisors is an integer number (20769210).

Almost surely, 2^217131142 is an apocalyptic number.

217131142 is a deficient number, since it is larger than the sum of its proper divisors (115176218).

217131142 is a wasteful number, since it uses less digits than its factorization.

217131142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2927.

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

The square root of 217131142 is about 14735.3704398634. The cubic root of 217131142 is about 601.0455307545.

Adding to 217131142 its reverse (241131712), we get a palindrome (458262854).

The spelling of 217131142 in words is "two hundred seventeen million, one hundred thirty-one thousand, one hundred forty-two".