12100211221 has 16 divisors (see below), whose sum is σ = 13938822144. Its totient is φ = 10289430144.

The previous prime is 12100211219. The next prime is 12100211273. The reversal of 12100211221 is 12211200121.

It is not a de Polignac number, because 12100211221 - 2¹ = 12100211219 is a prime.

It is a super-2 number, since 2×12100211221² (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 (12100211021) 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, 438396 + ... + 465178.

It is an arithmetic number, because the mean of its divisors is an integer number (871176384).

Almost surely, 2^12100211221 is an apocalyptic number.

It is an amenable number.

12100211221 is a deficient number, since it is larger than the sum of its proper divisors (1838610923).

12100211221 is a wasteful number, since it uses less digits than its factorization.

12100211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27300.

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

Adding to 12100211221 its reverse (12211200121), we get a palindrome (24311411342).

The spelling of 12100211221 in words is "twelve billion, one hundred million, two hundred eleven thousand, two hundred twenty-one".