221222210021221 has 2 divisors, whose sum is σ = 221222210021222. Its totient is φ = 221222210021220.

The previous prime is 221222210021161. The next prime is 221222210021269. The reversal of 221222210021221 is 122120012222122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130356132204321 + 90866077816900 = 11417361^2 + 9532370^2 .

It is a cyclic number.

It is not a de Polignac number, because 221222210021221 - 2¹⁹ = 221222209496933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221222210021192 and 221222210021201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221222210022221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611105010610 + 110611105010611.

It is an arithmetic number, because the mean of its divisors is an integer number (110611105010611).

Almost surely, 2^{221222210021221} is an apocalyptic number.

It is an amenable number.

221222210021221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222210021221 is an equidigital number, since it uses as much as digits as its factorization.

221222210021221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 221222210021221 its reverse (122120012222122), we get a palindrome (343342222243343).

The spelling of 221222210021221 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred ten million, twenty-one thousand, two hundred twenty-one".