217121234 has 16 divisors (see below), whose sum is σ = 358006176. Its totient is φ = 97936800.

The previous prime is 217121221. The next prime is 217121243. The reversal of 217121234 is 432121712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34787 + ... + 40550.

It is an arithmetic number, because the mean of its divisors is an integer number (22375386).

Almost surely, 2^217121234 is an apocalyptic number.

217121234 is a deficient number, since it is larger than the sum of its proper divisors (140884942).

217121234 is a wasteful number, since it uses less digits than its factorization.

217121234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75481.

The product of its digits is 672, while the sum is 23.

The square root of 217121234 is about 14735.0342381686. The cubic root of 217121234 is about 601.0363884306.

Adding to 217121234 its reverse (432121712), we get a palindrome (649242946).

The spelling of 217121234 in words is "two hundred seventeen million, one hundred twenty-one thousand, two hundred thirty-four".