221010210210221 has 2 divisors, whose sum is σ = 221010210210222. Its totient is φ = 221010210210220.

The previous prime is 221010210210199. The next prime is 221010210210271. The reversal of 221010210210221 is 122012012010122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217308549649321 + 3701660560900 = 14741389^2 + 1923970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221010210210221 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221010210210221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221010210210271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505105105110 + 110505105105111.

It is an arithmetic number, because the mean of its divisors is an integer number (110505105105111).

Almost surely, 2^{221010210210221} is an apocalyptic number.

It is an amenable number.

221010210210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221010210210221 is an equidigital number, since it uses as much as digits as its factorization.

221010210210221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221010210210221 its reverse (122012012010122), we get a palindrome (343022222220343).

The spelling of 221010210210221 in words is "two hundred twenty-one trillion, ten billion, two hundred ten million, two hundred ten thousand, two hundred twenty-one".