12221775 has 18 divisors (see below), whose sum is σ = 21890960. Its totient is φ = 6518160.

The previous prime is 12221771. The next prime is 12221801. The reversal of 12221775 is 57712221.

It is not a de Polignac number, because 12221775 - 2² = 12221771 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221771) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 26935 + ... + 27384.

Almost surely, 2^12221775 is an apocalyptic number.

12221775 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12221775 is a deficient number, since it is larger than the sum of its proper divisors (9669185).

12221775 is a wasteful number, since it uses less digits than its factorization.

12221775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54335 (or 54327 counting only the distinct ones).

The product of its digits is 1960, while the sum is 27.

The square root of 12221775 is about 3495.9655318667. The cubic root of 12221775 is about 230.3446314253.

Adding to 12221775 its reverse (57712221), we get a palindrome (69933996).

It can be divided in two parts, 12221 and 775, that added together give a square (12996 = 114²).

The spelling of 12221775 in words is "twelve million, two hundred twenty-one thousand, seven hundred seventy-five".