2212221021221 has 4 divisors (see below), whose sum is σ = 2226311601132. Its totient is φ = 2198130441312.

The previous prime is 2212221021209. The next prime is 2212221021331. The reversal of 2212221021221 is 1221201222122.

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 191590044100 + 2020630977121 = 437710^2 + 1421489^2 .

It is a cyclic number.

It is not a de Polignac number, because 2212221021221 - 2³⁴ = 2195041152037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2212221021193 and 2212221021202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2212221021721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7045289720 + ... + 7045290033.

It is an arithmetic number, because the mean of its divisors is an integer number (556577900283).

Almost surely, 2^{2212221021221} is an apocalyptic number.

It is an amenable number.

2212221021221 is a deficient number, since it is larger than the sum of its proper divisors (14090579911).

2212221021221 is a wasteful number, since it uses less digits than its factorization.

2212221021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14090579910.

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

Adding to 2212221021221 its reverse (1221201222122), we get a palindrome (3433422243343).

The spelling of 2212221021221 in words is "two trillion, two hundred twelve billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty-one".