121020012009 has 64 divisors (see below), whose sum is σ = 197085208320. Its totient is φ = 72934318080.

The previous prime is 121020011993. The next prime is 121020012013. The reversal of 121020012009 is 900210020121.

It is not a de Polignac number, because 121020012009 - 2⁴ = 121020011993 is a prime.

It is a super-3 number, since 3×121020012009³ (a number of 34 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121020011982 and 121020012000.

It is not an unprimeable number, because it can be changed into a prime (121020012049) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10616617 + ... + 10628009.

It is an arithmetic number, because the mean of its divisors is an integer number (3079456380).

Almost surely, 2^121020012009 is an apocalyptic number.

It is an amenable number.

121020012009 is a deficient number, since it is larger than the sum of its proper divisors (76065196311).

121020012009 is a wasteful number, since it uses less digits than its factorization.

121020012009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12039 (or 12033 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The spelling of 121020012009 in words is "one hundred twenty-one billion, twenty million, twelve thousand, nine".