221616932917 has 2 divisors, whose sum is σ = 221616932918. Its totient is φ = 221616932916.

The previous prime is 221616932903. The next prime is 221616932947. The reversal of 221616932917 is 719239616122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 219915040401 + 1701892516 = 468951^2 + 41254^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221616932917 is a prime.

It is a super-2 number, since 2×221616932917² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221616932947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110808466458 + 110808466459.

It is an arithmetic number, because the mean of its divisors is an integer number (110808466459).

Almost surely, 2^221616932917 is an apocalyptic number.

It is an amenable number.

221616932917 is a deficient number, since it is larger than the sum of its proper divisors (1).

221616932917 is an equidigital number, since it uses as much as digits as its factorization.

221616932917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 49.

The spelling of 221616932917 in words is "two hundred twenty-one billion, six hundred sixteen million, nine hundred thirty-two thousand, nine hundred seventeen".