121343231205 has 96 divisors (see below), whose sum is σ = 246612457728. Its totient is φ = 54035942400.

The previous prime is 121343231183. The next prime is 121343231213. The reversal of 121343231205 is 502132343121.

121343231205 is a `hidden beast` number, since 1 + 2 + 1 + 343 + 2 + 312 + 0 + 5 = 666.

It is not a de Polignac number, because 121343231205 - 2⁷ = 121343231077 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 (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8917467 + ... + 8931063.

It is an arithmetic number, because the mean of its divisors is an integer number (2568879768).

Almost surely, 2^121343231205 is an apocalyptic number.

121343231205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121343231205 is an abundant number, since it is smaller than the sum of its proper divisors (125269226523).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121343231205 is a wasteful number, since it uses less digits than its factorization.

121343231205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14347 (or 14344 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 121343231205 its reverse (502132343121), we get a palindrome (623475574326).

The spelling of 121343231205 in words is "one hundred twenty-one billion, three hundred forty-three million, two hundred thirty-one thousand, two hundred five".