16217055121 has 2 divisors, whose sum is σ = 16217055122. Its totient is φ = 16217055120.

The previous prime is 16217055077. The next prime is 16217055137. The reversal of 16217055121 is 12155071261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10376274496 + 5840780625 = 101864^2 + 76425^2 .

It is a cyclic number.

It is not a de Polignac number, because 16217055121 - 2¹⁷ = 16216924049 is a prime.

It is not a weakly prime, because it can be changed into another prime (16217055521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8108527560 + 8108527561.

It is an arithmetic number, because the mean of its divisors is an integer number (8108527561).

Almost surely, 2^16217055121 is an apocalyptic number.

It is an amenable number.

16217055121 is a deficient number, since it is larger than the sum of its proper divisors (1).

16217055121 is an equidigital number, since it uses as much as digits as its factorization.

16217055121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 31.

The spelling of 16217055121 in words is "sixteen billion, two hundred seventeen million, fifty-five thousand, one hundred twenty-one".