12121205 has 4 divisors (see below), whose sum is σ = 14545452. Its totient is φ = 9696960.

The previous prime is 12121157. The next prime is 12121211. The reversal of 12121205 is 50212121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50212121 = 47 ⋅1068343.

It can be written as a sum of positive squares in 2 ways, for example, as 4157521 + 7963684 = 2039^2 + 2822^2 .

It is not a de Polignac number, because 12121205 - 2¹⁰ = 12120181 is a prime.

It is a super-2 number, since 2×12121205² = 293847221304050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12121205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212116 + ... + 1212125.

It is an arithmetic number, because the mean of its divisors is an integer number (3636363).

Almost surely, 2^12121205 is an apocalyptic number.

It is an amenable number.

12121205 is a deficient number, since it is larger than the sum of its proper divisors (2424247).

12121205 is an equidigital number, since it uses as much as digits as its factorization.

12121205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424246.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 12121205 is about 3481.5520964076. The cubic root of 12121205 is about 229.7110738758.

Adding to 12121205 its reverse (50212121), we get a palindrome (62333326).

The spelling of 12121205 in words is "twelve million, one hundred twenty-one thousand, two hundred five".