121201010109 has 6 divisors (see below), whose sum is σ = 175068125726. Its totient is φ = 80800673400.

The previous prime is 121201010071. The next prime is 121201010141. The reversal of 121201010109 is 901010102121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 62735220900 + 58465789209 = 250470^2 + 241797^2 .

It is not a de Polignac number, because 121201010109 - 2¹⁶ = 121200944573 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121201010091 and 121201010100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201010309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6733389442 + ... + 6733389459.

Almost surely, 2^121201010109 is an apocalyptic number.

It is an amenable number.

121201010109 is a deficient number, since it is larger than the sum of its proper divisors (53867115617).

121201010109 is a wasteful number, since it uses less digits than its factorization.

121201010109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13466778907 (or 13466778904 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 121201010109 in words is "one hundred twenty-one billion, two hundred one million, ten thousand, one hundred nine".