12211112220221 has 4 divisors (see below), whose sum is σ = 12307262710272. Its totient is φ = 12114961730172.

The previous prime is 12211112220193. The next prime is 12211112220253. The reversal of 12211112220221 is 12202221111221.

12211112220221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12211112220221 - 2³⁸ = 11936234313277 is a prime.

It is a super-4 number, since 4×12211112220221⁴ (a number of 53 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12211112220193 and 12211112220202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211112270221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48075244835 + ... + 48075245088.

It is an arithmetic number, because the mean of its divisors is an integer number (3076815677568).

Almost surely, 2^{12211112220221} is an apocalyptic number.

It is an amenable number.

12211112220221 is a deficient number, since it is larger than the sum of its proper divisors (96150490051).

12211112220221 is an equidigital number, since it uses as much as digits as its factorization.

12211112220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96150490050.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 12211112220221 its reverse (12202221111221), we get a palindrome (24413333331442).

The spelling of 12211112220221 in words is "twelve trillion, two hundred eleven billion, one hundred twelve million, two hundred twenty thousand, two hundred twenty-one".