217413045871 has 4 divisors (see below), whose sum is σ = 248472052432. Its totient is φ = 186354039312.

The previous prime is 217413045851. The next prime is 217413045877. The reversal of 217413045871 is 178540314712.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 217413045871 - 2¹¹ = 217413043823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217413045877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15529503270 + ... + 15529503283.

It is an arithmetic number, because the mean of its divisors is an integer number (62118013108).

Almost surely, 2^217413045871 is an apocalyptic number.

217413045871 is a deficient number, since it is larger than the sum of its proper divisors (31059006561).

217413045871 is an equidigital number, since it uses as much as digits as its factorization.

217413045871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31059006560.

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 217413045871 in words is "two hundred seventeen billion, four hundred thirteen million, forty-five thousand, eight hundred seventy-one".