217111702047 has 96 divisors (see below), whose sum is σ = 322962038784. Its totient is φ = 129194956800.

The previous prime is 217111702019. The next prime is 217111702051. The reversal of 217111702047 is 740207111712.

It is not a de Polignac number, because 217111702047 - 2¹² = 217111697951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 217111701999 and 217111702017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217111702147) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1657341172 + ... + 1657341302.

It is an arithmetic number, because the mean of its divisors is an integer number (3364187904).

Almost surely, 2^217111702047 is an apocalyptic number.

217111702047 is a deficient number, since it is larger than the sum of its proper divisors (105850336737).

217111702047 is a wasteful number, since it uses less digits than its factorization.

217111702047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 33.

Adding to 217111702047 its reverse (740207111712), we get a palindrome (957318813759).

The spelling of 217111702047 in words is "two hundred seventeen billion, one hundred eleven million, seven hundred two thousand, forty-seven".