217042310884 has 81 divisors (see below), whose sum is σ = 447442742019. Its totient is φ = 91852506480.

The previous prime is 217042310879. The next prime is 217042310957. The reversal of 217042310884 is 488013240712.

The square root of 217042310884 is 465878.

It is a perfect power (a square), and thus also a powerful number.

217042310884 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×217042310884² (a number of 23 digits) contains 22 as substring.

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 26 ways as a sum of consecutive naturals, for example, 697885089 + ... + 697885399.

Almost surely, 2^217042310884 is an apocalyptic number.

217042310884 is the 465878-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 217042310884

217042310884 is an abundant number, since it is smaller than the sum of its proper divisors (230400431135).

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

217042310884 is an equidigital number, since it uses as much as digits as its factorization.

217042310884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 40.

The spelling of 217042310884 in words is "two hundred seventeen billion, forty-two million, three hundred ten thousand, eight hundred eighty-four".