221210200031221 has 2 divisors, whose sum is σ = 221210200031222. Its totient is φ = 221210200031220.

The previous prime is 221210200031101. The next prime is 221210200031243. The reversal of 221210200031221 is 122130002012122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218485026375121 + 2725173656100 = 14781239^2 + 1650810^2 .

It is a cyclic number.

It is not a de Polignac number, because 221210200031221 - 2¹⁷ = 221210199900149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221210200071221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605100015610 + 110605100015611.

It is an arithmetic number, because the mean of its divisors is an integer number (110605100015611).

Almost surely, 2^{221210200031221} is an apocalyptic number.

It is an amenable number.

221210200031221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221210200031221 is an equidigital number, since it uses as much as digits as its factorization.

221210200031221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221210200031221 its reverse (122130002012122), we get a palindrome (343340202043343).

The spelling of 221210200031221 in words is "two hundred twenty-one trillion, two hundred ten billion, two hundred million, thirty-one thousand, two hundred twenty-one".