12221955 has 16 divisors (see below), whose sum is σ = 21728160. Its totient is φ = 6518304.

The previous prime is 12221917. The next prime is 12221969. The reversal of 12221955 is 55912221.

It is not a de Polignac number, because 12221955 - 2¹² = 12217859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45132 + ... + 45401.

It is an arithmetic number, because the mean of its divisors is an integer number (1358010).

Almost surely, 2^12221955 is an apocalyptic number.

12221955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12221955 is a deficient number, since it is larger than the sum of its proper divisors (9506205).

12221955 is an equidigital number, since it uses as much as digits as its factorization.

12221955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90547 (or 90541 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 12221955 is about 3495.9912757328. The cubic root of 12221955 is about 230.3457622439.

The spelling of 12221955 in words is "twelve million, two hundred twenty-one thousand, nine hundred fifty-five".