221202212105221 has 2 divisors, whose sum is σ = 221202212105222. Its totient is φ = 221202212105220.

The previous prime is 221202212105201. The next prime is 221202212105243. The reversal of 221202212105221 is 122501212202122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194675437432996 + 26526774672225 = 13952614^2 + 5150415^2 .

It is a cyclic number.

It is not a de Polignac number, because 221202212105221 - 2²⁷ = 221202077887493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221202212105201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110601106052610 + 110601106052611.

It is an arithmetic number, because the mean of its divisors is an integer number (110601106052611).

Almost surely, 2^{221202212105221} is an apocalyptic number.

It is an amenable number.

221202212105221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221202212105221 is an equidigital number, since it uses as much as digits as its factorization.

221202212105221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 25.

Adding to 221202212105221 its reverse (122501212202122), we get a palindrome (343703424307343).

The spelling of 221202212105221 in words is "two hundred twenty-one trillion, two hundred two billion, two hundred twelve million, one hundred five thousand, two hundred twenty-one".