12220100121221 has 4 divisors (see below), whose sum is σ = 12220112899500. Its totient is φ = 12220087342944.

The previous prime is 12220100121217. The next prime is 12220100121247. The reversal of 12220100121221 is 12212100102221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4058713890625 + 8161386230596 = 2014625^2 + 2856814^2 .

It is a cyclic number.

It is not a de Polignac number, because 12220100121221 - 2² = 12220100121217 is a prime.

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 12220100121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220180121221) 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, 4827416 + ... + 6909713.

It is an arithmetic number, because the mean of its divisors is an integer number (3055028224875).

Almost surely, 2^{12220100121221} is an apocalyptic number.

It is an amenable number.

12220100121221 is a deficient number, since it is larger than the sum of its proper divisors (12778279).

12220100121221 is a wasteful number, since it uses less digits than its factorization.

12220100121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12778278.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 12220100121221 its reverse (12212100102221), we get a palindrome (24432200223442).

The spelling of 12220100121221 in words is "twelve trillion, two hundred twenty billion, one hundred million, one hundred twenty-one thousand, two hundred twenty-one".