121331205 has 24 divisors (see below), whose sum is σ = 214785792. Its totient is φ = 63332064.

The previous prime is 121331191. The next prime is 121331213. The reversal of 121331205 is 502133121.

It is not a de Polignac number, because 121331205 - 2⁸ = 121330949 is a prime.

It is a super-2 number, since 2×121331205² = 29442522613504050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26569 + ... + 30798.

It is an arithmetic number, because the mean of its divisors is an integer number (8949408).

Almost surely, 2^121331205 is an apocalyptic number.

121331205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121331205 is a deficient number, since it is larger than the sum of its proper divisors (93454587).

121331205 is a wasteful number, since it uses less digits than its factorization.

121331205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57425 (or 57422 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 121331205 is about 11015.0444847036. The cubic root of 121331205 is about 495.0596193877.

Adding to 121331205 its reverse (502133121), we get a palindrome (623464326).

The spelling of 121331205 in words is "one hundred twenty-one million, three hundred thirty-one thousand, two hundred five".