2212221201221 has 4 divisors (see below), whose sum is σ = 2213000978892. Its totient is φ = 2211441423552.

The previous prime is 2212221201187. The next prime is 2212221201263. The reversal of 2212221201221 is 1221021222122.

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 324317721121 + 1887903480100 = 569489^2 + 1374010^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212221201221 - 2¹⁰ = 2212221200197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2212221201193 and 2212221201202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212221200221) 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, 389884580 + ... + 389890253.

It is an arithmetic number, because the mean of its divisors is an integer number (553250244723).

Almost surely, 2^{2212221201221} is an apocalyptic number.

It is an amenable number.

2212221201221 is a deficient number, since it is larger than the sum of its proper divisors (779777671).

2212221201221 is an equidigital number, since it uses as much as digits as its factorization.

2212221201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779777670.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 2212221201221 its reverse (1221021222122), we get a palindrome (3433242423343).

The spelling of 2212221201221 in words is "two trillion, two hundred twelve billion, two hundred twenty-one million, two hundred one thousand, two hundred twenty-one".