121210221009 has 16 divisors (see below), whose sum is σ = 161762661632. Its totient is φ = 80732341008.

The previous prime is 121210220959. The next prime is 121210221029. The reversal of 121210221009 is 900122012121.

It is not a de Polignac number, because 121210221009 - 2⁸ = 121210220753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121210221029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21785862 + ... + 21791424.

It is an arithmetic number, because the mean of its divisors is an integer number (10110166352).

Almost surely, 2^121210221009 is an apocalyptic number.

It is an amenable number.

121210221009 is a deficient number, since it is larger than the sum of its proper divisors (40552440623).

121210221009 is a wasteful number, since it uses less digits than its factorization.

121210221009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10956.

The product of its (nonzero) digits is 144, while the sum is 21.

The spelling of 121210221009 in words is "one hundred twenty-one billion, two hundred ten million, two hundred twenty-one thousand, nine".