217230045245 has 32 divisors (see below), whose sum is σ = 263397277440. Its totient is φ = 171982379520.

The previous prime is 217230045229. The next prime is 217230045251. The reversal of 217230045245 is 542540032712.

It is not a de Polignac number, because 217230045245 - 2⁴ = 217230045229 is a prime.

It is a super-2 number, since 2×217230045245² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 210697880 + ... + 210698910.

It is an arithmetic number, because the mean of its divisors is an integer number (8231164920).

Almost surely, 2^217230045245 is an apocalyptic number.

It is an amenable number.

217230045245 is a deficient number, since it is larger than the sum of its proper divisors (46167232195).

217230045245 is a wasteful number, since it uses less digits than its factorization.

217230045245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165.

The product of its (nonzero) digits is 67200, while the sum is 35.

Adding to 217230045245 its reverse (542540032712), we get a palindrome (759770077957).

The spelling of 217230045245 in words is "two hundred seventeen billion, two hundred thirty million, forty-five thousand, two hundred forty-five".