200117556421 has 2 divisors, whose sum is σ = 200117556422. Its totient is φ = 200117556420.

The previous prime is 200117556361. The next prime is 200117556433. The reversal of 200117556421 is 124655711002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 200117549025 + 7396 = 447345^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 200117556421 - 2⁹ = 200117555909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200117656421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100058778210 + 100058778211.

It is an arithmetic number, because the mean of its divisors is an integer number (100058778211).

Almost surely, 2^200117556421 is an apocalyptic number.

It is an amenable number.

200117556421 is a deficient number, since it is larger than the sum of its proper divisors (1).

200117556421 is an equidigital number, since it uses as much as digits as its factorization.

200117556421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 200117556421 in words is "two hundred billion, one hundred seventeen million, five hundred fifty-six thousand, four hundred twenty-one".