12221165645 has 32 divisors (see below), whose sum is σ = 16456003200. Its totient is φ = 8650785024.

The previous prime is 12221165629. The next prime is 12221165669. The reversal of 12221165645 is 54656112221.

It is a cyclic number.

It is not a de Polignac number, because 12221165645 - 2⁴ = 12221165629 is a prime.

It is a super-3 number, since 3×12221165645³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 238694 + ... + 285336.

It is an arithmetic number, because the mean of its divisors is an integer number (514250100).

Almost surely, 2^12221165645 is an apocalyptic number.

It is an amenable number.

12221165645 is a deficient number, since it is larger than the sum of its proper divisors (4234837555).

12221165645 is a wasteful number, since it uses less digits than its factorization.

12221165645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46829.

The product of its digits is 28800, while the sum is 35.

Adding to 12221165645 its reverse (54656112221), we get a palindrome (66877277866).

The spelling of 12221165645 in words is "twelve billion, two hundred twenty-one million, one hundred sixty-five thousand, six hundred forty-five".