121220210109 has 16 divisors (see below), whose sum is σ = 161859769280. Its totient is φ = 80697150720.

The previous prime is 121220210107. The next prime is 121220210123. The reversal of 121220210109 is 901012022121.

It is not a de Polignac number, because 121220210109 - 2¹ = 121220210107 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220210107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6297702 + ... + 6316920.

It is an arithmetic number, because the mean of its divisors is an integer number (10116235580).

Almost surely, 2^121220210109 is an apocalyptic number.

It is an amenable number.

121220210109 is a deficient number, since it is larger than the sum of its proper divisors (40639559171).

121220210109 is a wasteful number, since it uses less digits than its factorization.

121220210109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22140.

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

The spelling of 121220210109 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred ten thousand, one hundred nine".