217020239005 has 12 divisors (see below), whose sum is σ = 267653019060. Its totient is φ = 168923856384.

The previous prime is 217020238999. The next prime is 217020239011. The reversal of 217020239005 is 500932020712.

It is an interprime number because it is at equal distance from previous prime (217020238999) and next prime (217020239011).

It can be written as a sum of positive squares in 6 ways, for example, as 12841875684 + 204178363321 = 113322^2 + 451861^2 .

It is not a de Polignac number, because 217020239005 - 2¹⁵ = 217020206237 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15845620 + ... + 15859309.

It is an arithmetic number, because the mean of its divisors is an integer number (22304418255).

Almost surely, 2^217020239005 is an apocalyptic number.

It is an amenable number.

217020239005 is a deficient number, since it is larger than the sum of its proper divisors (50632780055).

217020239005 is an equidigital number, since it uses as much as digits as its factorization.

217020239005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31705008 (or 31704971 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

Adding to 217020239005 its reverse (500932020712), we get a palindrome (717952259717).

The spelling of 217020239005 in words is "two hundred seventeen billion, twenty million, two hundred thirty-nine thousand, five".