12221577 has 16 divisors (see below), whose sum is σ = 18223680. Its totient is φ = 8094816.

The previous prime is 12221543. The next prime is 12221593. The reversal of 12221577 is 77512221.

It is not a de Polignac number, because 12221577 - 2⁷ = 12221449 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 12221577.

It is not an unprimeable number, because it can be changed into a prime (12221527) by changing a digit.

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, 3013 + ... + 5789.

It is an arithmetic number, because the mean of its divisors is an integer number (1138980).

Almost surely, 2^12221577 is an apocalyptic number.

It is an amenable number.

12221577 is a deficient number, since it is larger than the sum of its proper divisors (6002103).

12221577 is a wasteful number, since it uses less digits than its factorization.

12221577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2949 (or 2943 counting only the distinct ones).

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

The square root of 12221577 is about 3495.9372133950. The cubic root of 12221577 is about 230.3433875121.

Adding to 12221577 its reverse (77512221), we get a palindrome (89733798).

The spelling of 12221577 in words is "twelve million, two hundred twenty-one thousand, five hundred seventy-seven".