121112001009 has 20 divisors (see below), whose sum is σ = 185127852976. Its totient is φ = 78863626296.

The previous prime is 121112000939. The next prime is 121112001053. The reversal of 121112001009 is 900100211121.

It is a happy number.

It is not a de Polignac number, because 121112001009 - 2⁹ = 121112000497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121112000982 and 121112001000.

It is not an unprimeable number, because it can be changed into a prime (121112001509) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17382679 + ... + 17389644.

Almost surely, 2^121112001009 is an apocalyptic number.

It is an amenable number.

121112001009 is a deficient number, since it is larger than the sum of its proper divisors (64015851967).

121112001009 is an equidigital number, since it uses as much as digits as its factorization.

121112001009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34772378 (or 34772369 counting only the distinct ones).

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

The spelling of 121112001009 in words is "one hundred twenty-one billion, one hundred twelve million, one thousand, nine".