121201011009 has 48 divisors (see below), whose sum is σ = 193920574848. Its totient is φ = 72472651776.

The previous prime is 121201010999. The next prime is 121201011017. The reversal of 121201011009 is 900110102121.

It is a happy number.

It is not a de Polignac number, because 121201011009 - 2²³ = 121192622401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121201010982 and 121201011000.

It is not an unprimeable number, because it can be changed into a prime (121201011049) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 908572 + ... + 1033394.

It is an arithmetic number, because the mean of its divisors is an integer number (4040011976).

Almost surely, 2^121201011009 is an apocalyptic number.

It is an amenable number.

121201011009 is a deficient number, since it is larger than the sum of its proper divisors (72719563839).

121201011009 is a wasteful number, since it uses less digits than its factorization.

121201011009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125078 (or 125075 counting only the distinct ones).

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

The spelling of 121201011009 in words is "one hundred twenty-one billion, two hundred one million, eleven thousand, nine".