121112102009 has 2 divisors, whose sum is σ = 121112102010. Its totient is φ = 121112102008.

The previous prime is 121112101937. The next prime is 121112102011. The reversal of 121112102009 is 900201211121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61319626384 + 59792475625 = 247628^2 + 244525^2 .

It is an emirp because it is prime and its reverse (900201211121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121112102009 - 2⁸ = 121112101753 is a prime.

Together with 121112102011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121112102039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60556051004 + 60556051005.

It is an arithmetic number, because the mean of its divisors is an integer number (60556051005).

Almost surely, 2^121112102009 is an apocalyptic number.

It is an amenable number.

121112102009 is a deficient number, since it is larger than the sum of its proper divisors (1).

121112102009 is an equidigital number, since it uses as much as digits as its factorization.

121112102009 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 121112102009 in words is "one hundred twenty-one billion, one hundred twelve million, one hundred two thousand, nine".