121211111201009 has 2 divisors, whose sum is σ = 121211111201010. Its totient is φ = 121211111201008.

The previous prime is 121211111200913. The next prime is 121211111201029. The reversal of 121211111201009 is 900102111112121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116053543024225 + 5157568176784 = 10772815^2 + 2271028^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121211111201009 is a prime.

It is not a weakly prime, because it can be changed into another prime (121211111201029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605555600504 + 60605555600505.

It is an arithmetic number, because the mean of its divisors is an integer number (60605555600505).

Almost surely, 2^{121211111201009} is an apocalyptic number.

It is an amenable number.

121211111201009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211111201009 is an equidigital number, since it uses as much as digits as its factorization.

121211111201009 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 23.

The spelling of 121211111201009 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred eleven million, two hundred one thousand, nine".