121061206205 has 4 divisors (see below), whose sum is σ = 145273447452. Its totient is φ = 96848964960.

The previous prime is 121061206187. The next prime is 121061206213. The reversal of 121061206205 is 502602160121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 93163521529 + 27897684676 = 305227^2 + 167026^2 .

It is not a de Polignac number, because 121061206205 - 2¹² = 121061202109 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 (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12106120616 + ... + 12106120625.

It is an arithmetic number, because the mean of its divisors is an integer number (36318361863).

Almost surely, 2^121061206205 is an apocalyptic number.

It is an amenable number.

121061206205 is a deficient number, since it is larger than the sum of its proper divisors (24212241247).

121061206205 is an equidigital number, since it uses as much as digits as its factorization.

121061206205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24212241246.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 121061206205 its reverse (502602160121), we get a palindrome (623663366326).

The spelling of 121061206205 in words is "one hundred twenty-one billion, sixty-one million, two hundred six thousand, two hundred five".