121335525205 has 4 divisors (see below), whose sum is σ = 145602630252. Its totient is φ = 97068420160.

The previous prime is 121335525167. The next prime is 121335525209. The reversal of 121335525205 is 502525533121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 502525533121 = 223 ⋅2253477727.

It can be written as a sum of positive squares in 2 ways, for example, as 13224770001 + 108110755204 = 114999^2 + 328802^2 .

It is not a de Polignac number, because 121335525205 - 2¹³ = 121335517013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121335525209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12133552516 + ... + 12133552525.

It is an arithmetic number, because the mean of its divisors is an integer number (36400657563).

Almost surely, 2^121335525205 is an apocalyptic number.

It is an amenable number.

121335525205 is a deficient number, since it is larger than the sum of its proper divisors (24267105047).

121335525205 is an equidigital number, since it uses as much as digits as its factorization.

121335525205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24267105046.

The product of its (nonzero) digits is 45000, while the sum is 34.

The spelling of 121335525205 in words is "one hundred twenty-one billion, three hundred thirty-five million, five hundred twenty-five thousand, two hundred five".