12205555 has 4 divisors (see below), whose sum is σ = 14646672. Its totient is φ = 9764440.

The previous prime is 12205553. The next prime is 12205561. The reversal of 12205555 is 55550221.

It is a happy number.

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

It is not a de Polignac number, because 12205555 - 2¹ = 12205553 is a prime.

It is a Duffinian number.

12205555 is a modest number, since divided by 5555 gives 1220 as remainder.

It is not an unprimeable number, because it can be changed into a prime (12205553) 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, 1220551 + ... + 1220560.

It is an arithmetic number, because the mean of its divisors is an integer number (3661668).

Almost surely, 2^12205555 is an apocalyptic number.

12205555 is a deficient number, since it is larger than the sum of its proper divisors (2441117).

12205555 is an equidigital number, since it uses as much as digits as its factorization.

12205555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441116.

The product of its (nonzero) digits is 2500, while the sum is 25.

The square root of 12205555 is about 3493.6449447533. The cubic root of 12205555 is about 230.2426864963.

Adding to 12205555 its reverse (55550221), we get a palindrome (67755776).

The spelling of 12205555 in words is "twelve million, two hundred five thousand, five hundred fifty-five".