217612211267 has 6 divisors (see below), whose sum is σ = 239193587724. Its totient is φ = 197829282860.

The previous prime is 217612211261. The next prime is 217612211291. The reversal of 217612211267 is 762112216712.

It is a happy number.

It is not a de Polignac number, because 217612211267 - 2³⁰ = 216538469443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 217612211267.

It is not an unprimeable number, because it can be changed into a prime (217612211261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 899223893 + ... + 899224134.

It is an arithmetic number, because the mean of its divisors is an integer number (39865597954).

Almost surely, 2^217612211267 is an apocalyptic number.

217612211267 is a deficient number, since it is larger than the sum of its proper divisors (21581376457).

217612211267 is a wasteful number, since it uses less digits than its factorization.

217612211267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798448049 (or 1798448038 counting only the distinct ones).

The product of its digits is 28224, while the sum is 38.

Adding to 217612211267 its reverse (762112216712), we get a palindrome (979724427979).

Subtracting 217612211267 from its reverse (762112216712), we obtain a palindrome (544500005445).

The spelling of 217612211267 in words is "two hundred seventeen billion, six hundred twelve million, two hundred eleven thousand, two hundred sixty-seven".