121220201109 has 16 divisors (see below), whose sum is σ = 184799068160. Its totient is φ = 69237722160.

The previous prime is 121220201107. The next prime is 121220201119. The reversal of 121220201109 is 901102022121.

It is not a de Polignac number, because 121220201109 - 2¹ = 121220201107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121220201107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1242037 + ... + 1336074.

It is an arithmetic number, because the mean of its divisors is an integer number (11549941760).

Almost surely, 2^121220201109 is an apocalyptic number.

It is an amenable number.

121220201109 is a deficient number, since it is larger than the sum of its proper divisors (63578867051).

121220201109 is a wasteful number, since it uses less digits than its factorization.

121220201109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2580360.

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

The spelling of 121220201109 in words is "one hundred twenty-one billion, two hundred twenty million, two hundred one thousand, one hundred nine".