12221055 has 48 divisors (see below), whose sum is σ = 26417664. Its totient is φ = 5077440.

The previous prime is 12221039. The next prime is 12221057. The reversal of 12221055 is 55012221.

It is not a de Polignac number, because 12221055 - 2⁴ = 12221039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221057) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 1702 + ... + 5228.

It is an arithmetic number, because the mean of its divisors is an integer number (550368).

Almost surely, 2^12221055 is an apocalyptic number.

12221055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12221055 is an abundant number, since it is smaller than the sum of its proper divisors (14196609).

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

12221055 is a wasteful number, since it uses less digits than its factorization.

12221055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3556 (or 3553 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 12221055 is about 3495.8625545064. The cubic root of 12221055 is about 230.3401080401.

Adding to 12221055 its reverse (55012221), we get a palindrome (67233276).

It can be divided in two parts, 122210 and 55, that added together give a triangular number (122265 = T₄₉₄).

The spelling of 12221055 in words is "twelve million, two hundred twenty-one thousand, fifty-five".