122100100205 has 4 divisors (see below), whose sum is σ = 146520120252. Its totient is φ = 97680080160.

The previous prime is 122100100189. The next prime is 122100100237. The reversal of 122100100205 is 502001001221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502001001221 = 401 ⋅1251872821.

It can be written as a sum of positive squares in 2 ways, for example, as 63002004004 + 59098096201 = 251002^2 + 243101^2 .

It is not a de Polignac number, because 122100100205 - 2⁴ = 122100100189 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 122100100205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12210010016 + ... + 12210010025.

It is an arithmetic number, because the mean of its divisors is an integer number (36630030063).

Almost surely, 2^122100100205 is an apocalyptic number.

It is an amenable number.

122100100205 is a deficient number, since it is larger than the sum of its proper divisors (24420020047).

122100100205 is an equidigital number, since it uses as much as digits as its factorization.

122100100205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24420020046.

The product of its (nonzero) digits is 40, while the sum is 14.

Adding to 122100100205 its reverse (502001001221), we get a palindrome (624101101426).

The spelling of 122100100205 in words is "one hundred twenty-two billion, one hundred million, one hundred thousand, two hundred five".