217505012 has 24 divisors (see below), whose sum is σ = 386588160. Its totient is φ = 107059680.

The previous prime is 217505009. The next prime is 217505023. The reversal of 217505012 is 210505712.

It is a happy number.

It is a congruent number.

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, 135398 + ... + 136994.

It is an arithmetic number, because the mean of its divisors is an integer number (16107840).

Almost surely, 2^217505012 is an apocalyptic number.

It is an amenable number.

217505012 is a deficient number, since it is larger than the sum of its proper divisors (169083148).

217505012 is a wasteful number, since it uses less digits than its factorization.

217505012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111 (or 2109 counting only the distinct ones).

The product of its (nonzero) digits is 700, while the sum is 23.

The square root of 217505012 is about 14748.0511254877. The cubic root of 217505012 is about 601.3903055587.

Adding to 217505012 its product of nonzero digits (700), we get a palindrome (217505712).

It can be divided in two parts, 21750 and 5012, that added together give a palindrome (26762).

The spelling of 217505012 in words is "two hundred seventeen million, five hundred five thousand, twelve".