217161121504811 has 8 divisors (see below), whose sum is σ = 237007542348864. Its totient is φ = 197332117445320.

The previous prime is 217161121504787. The next prime is 217161121504829. The reversal of 217161121504811 is 118405121161712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 217161121504811 - 2²⁶ = 217161054395947 is a prime.

It is a super-2 number, since 2×217161121504811² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217161121506811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4354170065 + ... + 4354219938.

It is an arithmetic number, because the mean of its divisors is an integer number (29625942793608).

Almost surely, 2^{217161121504811} is an apocalyptic number.

217161121504811 is a deficient number, since it is larger than the sum of its proper divisors (19846420844053).

217161121504811 is a wasteful number, since it uses less digits than its factorization.

217161121504811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8708392281.

The product of its (nonzero) digits is 26880, while the sum is 41.

The spelling of 217161121504811 in words is "two hundred seventeen trillion, one hundred sixty-one billion, one hundred twenty-one million, five hundred four thousand, eight hundred eleven".