121220342105205 has 32 divisors (see below), whose sum is σ = 221928083380224. Its totient is φ = 55348006222656.

The previous prime is 121220342105183. The next prime is 121220342105243. The reversal of 121220342105205 is 502501243022121.

It is not a de Polignac number, because 121220342105205 - 2¹⁴ = 121220342088821 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 697905577 + ... + 698079246.

It is an arithmetic number, because the mean of its divisors is an integer number (6935252605632).

Almost surely, 2^{121220342105205} is an apocalyptic number.

121220342105205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121220342105205 is a deficient number, since it is larger than the sum of its proper divisors (100707741275019).

121220342105205 is a wasteful number, since it uses less digits than its factorization.

121220342105205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395985665.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 121220342105205 its reverse (502501243022121), we get a palindrome (623721585127326).

The spelling of 121220342105205 in words is "one hundred twenty-one trillion, two hundred twenty billion, three hundred forty-two million, one hundred five thousand, two hundred five".