12211100221 has 16 divisors (see below), whose sum is σ = 13219511040. Its totient is φ = 11235481600.

The previous prime is 12211100191. The next prime is 12211100249. The reversal of 12211100221 is 12200111221.

It is not a de Polignac number, because 12211100221 - 2²⁹ = 11674229309 is a prime.

It is a super-2 number, since 2×12211100221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211100281) 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, 734046 + ... + 750496.

It is an arithmetic number, because the mean of its divisors is an integer number (826219440).

Almost surely, 2^12211100221 is an apocalyptic number.

It is an amenable number.

12211100221 is a deficient number, since it is larger than the sum of its proper divisors (1008410819).

12211100221 is a wasteful number, since it uses less digits than its factorization.

12211100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17444.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12211100221 its reverse (12200111221), we get a palindrome (24411211442).

The spelling of 12211100221 in words is "twelve billion, two hundred eleven million, one hundred thousand, two hundred twenty-one".