217506012072 has 32 divisors (see below), whose sum is σ = 549148848480. Its totient is φ = 71784161600.

The previous prime is 217506012041. The next prime is 217506012091. The reversal of 217506012072 is 270210605712.

217506012072 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44862678 + ... + 44867525.

It is an arithmetic number, because the mean of its divisors is an integer number (17160901515).

Almost surely, 2^217506012072 is an apocalyptic number.

It is an amenable number.

217506012072 is an abundant number, since it is smaller than the sum of its proper divisors (331642836408).

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

217506012072 is a wasteful number, since it uses less digits than its factorization.

217506012072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89730313 (or 89730309 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

Adding to 217506012072 its reverse (270210605712), we get a palindrome (487716617784).

The spelling of 217506012072 in words is "two hundred seventeen billion, five hundred six million, twelve thousand, seventy-two".