200121111102109 has 2 divisors, whose sum is σ = 200121111102110. Its totient is φ = 200121111102108.

The previous prime is 200121111102079. The next prime is 200121111102113. The reversal of 200121111102109 is 901201111121002.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163251805662009 + 36869305440100 = 12777003^2 + 6072010^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121111102109 - 2⁴¹ = 197922087846557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 200121111102109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200121111102119) 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, 100060555551054 + 100060555551055.

It is an arithmetic number, because the mean of its divisors is an integer number (100060555551055).

Almost surely, 2^{200121111102109} is an apocalyptic number.

It is an amenable number.

200121111102109 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121111102109 is an equidigital number, since it uses as much as digits as its factorization.

200121111102109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 22.

The spelling of 200121111102109 in words is "two hundred trillion, one hundred twenty-one billion, one hundred eleven million, one hundred two thousand, one hundred nine".