121202010109 has 2 divisors, whose sum is σ = 121202010110. Its totient is φ = 121202010108.

The previous prime is 121202010103. The next prime is 121202010113. The reversal of 121202010109 is 901010202121.

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., 64555630084 + 56646380025 = 254078^2 + 238005^2 .

It is a cyclic number.

It is not a de Polignac number, because 121202010109 - 2²¹ = 121199912957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121202010103) 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, 60601005054 + 60601005055.

It is an arithmetic number, because the mean of its divisors is an integer number (60601005055).

Almost surely, 2^121202010109 is an apocalyptic number.

It is an amenable number.

121202010109 is a deficient number, since it is larger than the sum of its proper divisors (1).

121202010109 is an equidigital number, since it uses as much as digits as its factorization.

121202010109 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 19.

The spelling of 121202010109 in words is "one hundred twenty-one billion, two hundred two million, ten thousand, one hundred nine".