121001121205 has 4 divisors (see below), whose sum is σ = 145201345452. Its totient is φ = 96800896960.

The previous prime is 121001121191. The next prime is 121001121223. The reversal of 121001121205 is 502121100121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502121100121 = 105727 ⋅4749223.

It can be written as a sum of positive squares in 2 ways, for example, as 68438222449 + 52562898756 = 261607^2 + 229266^2 .

It is not a de Polignac number, because 121001121205 - 2⁷ = 121001121077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 12100112116 + ... + 12100112125.

It is an arithmetic number, because the mean of its divisors is an integer number (36300336363).

Almost surely, 2^121001121205 is an apocalyptic number.

It is an amenable number.

121001121205 is a deficient number, since it is larger than the sum of its proper divisors (24200224247).

121001121205 is an equidigital number, since it uses as much as digits as its factorization.

121001121205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24200224246.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 121001121205 its reverse (502121100121), we get a palindrome (623122221326).

The spelling of 121001121205 in words is "one hundred twenty-one billion, one million, one hundred twenty-one thousand, two hundred five".