121200211109 has 2 divisors, whose sum is σ = 121200211110. Its totient is φ = 121200211108.

The previous prime is 121200211049. The next prime is 121200211133. The reversal of 121200211109 is 901112002121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73602062209 + 47598148900 = 271297^2 + 218170^2 .

It is a cyclic number.

It is not a de Polignac number, because 121200211109 - 2¹² = 121200207013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121200211609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600105554 + 60600105555.

It is an arithmetic number, because the mean of its divisors is an integer number (60600105555).

Almost surely, 2^121200211109 is an apocalyptic number.

It is an amenable number.

121200211109 is a deficient number, since it is larger than the sum of its proper divisors (1).

121200211109 is an equidigital number, since it uses as much as digits as its factorization.

121200211109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 121200211109 in words is "one hundred twenty-one billion, two hundred million, two hundred eleven thousand, one hundred nine".