217173042 has 32 divisors (see below), whose sum is σ = 498178560. Its totient is φ = 70055280.

The previous prime is 217173037. The next prime is 217173043. The reversal of 217173042 is 240371712.

It is a happy number.

217173042 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 217172997 and 217173015.

It is not an unprimeable number, because it can be changed into a prime (217173043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63193 + ... + 66540.

It is an arithmetic number, because the mean of its divisors is an integer number (15568080).

Almost surely, 2^217173042 is an apocalyptic number.

217173042 is an abundant number, since it is smaller than the sum of its proper divisors (281005518).

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

217173042 is a wasteful number, since it uses less digits than its factorization.

217173042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129775 (or 129769 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 217173042 is about 14736.7921204040. The cubic root of 217173042 is about 601.0841897078.

The spelling of 217173042 in words is "two hundred seventeen million, one hundred seventy-three thousand, forty-two".