12211102221 has 16 divisors (see below), whose sum is σ = 16409167104. Its totient is φ = 8076950784.

The previous prime is 12211102217. The next prime is 12211102237. The reversal of 12211102221 is 12220111221.

It is not a de Polignac number, because 12211102221 - 2² = 12211102217 is a prime.

It is a super-2 number, since 2×12211102221² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12211102221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211102271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 871356 + ... + 885258.

It is an arithmetic number, because the mean of its divisors is an integer number (1025572944).

Almost surely, 2^12211102221 is an apocalyptic number.

It is an amenable number.

12211102221 is a deficient number, since it is larger than the sum of its proper divisors (4198064883).

12211102221 is a wasteful number, since it uses less digits than its factorization.

12211102221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16180.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 12211102221 its reverse (12220111221), we get a palindrome (24431213442).

The spelling of 12211102221 in words is "twelve billion, two hundred eleven million, one hundred two thousand, two hundred twenty-one".