121244512205 has 16 divisors (see below), whose sum is σ = 147010393584. Its totient is φ = 95986974720.

The previous prime is 121244512201. The next prime is 121244512229. The reversal of 121244512205 is 502215442121.

It can be written as a sum of positive squares in 8 ways, for example, as 24516670084 + 96727842121 = 156578^2 + 311011^2 .

It is not a de Polignac number, because 121244512205 - 2² = 121244512201 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 (121244512201) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 194777 + ... + 529553.

It is an arithmetic number, because the mean of its divisors is an integer number (9188149599).

Almost surely, 2^121244512205 is an apocalyptic number.

It is an amenable number.

121244512205 is a deficient number, since it is larger than the sum of its proper divisors (25765881379).

121244512205 is a wasteful number, since it uses less digits than its factorization.

121244512205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335536.

The product of its (nonzero) digits is 6400, while the sum is 29.

Adding to 121244512205 its reverse (502215442121), we get a palindrome (623459954326).

The spelling of 121244512205 in words is "one hundred twenty-one billion, two hundred forty-four million, five hundred twelve thousand, two hundred five".