12211121100221 has 8 divisors (see below), whose sum is σ = 12267033832704. Its totient is φ = 12155226958080.

The previous prime is 12211121100181. The next prime is 12211121100229. The reversal of 12211121100221 is 12200112111221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12211121100221 is a prime.

It is a super-2 number, since 2×12211121100221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12211121100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211121100229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3330020 + ... + 5959133.

It is an arithmetic number, because the mean of its divisors is an integer number (1533379229088).

Almost surely, 2^{12211121100221} is an apocalyptic number.

It is an amenable number.

12211121100221 is a deficient number, since it is larger than the sum of its proper divisors (55912732483).

12211121100221 is an equidigital number, since it uses as much as digits as its factorization.

12211121100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9295171.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12211121100221 its reverse (12200112111221), we get a palindrome (24411233211442).

The spelling of 12211121100221 in words is "twelve trillion, two hundred eleven billion, one hundred twenty-one million, one hundred thousand, two hundred twenty-one".