221121100110221 has 2 divisors, whose sum is σ = 221121100110222. Its totient is φ = 221121100110220.

The previous prime is 221121100110187. The next prime is 221121100110233. The reversal of 221121100110221 is 122011001121122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220825692642025 + 295407468196 = 14860205^2 + 543514^2 .

It is a cyclic number.

It is not a de Polignac number, because 221121100110221 - 2³⁴ = 221103920241037 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221121100110221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221121100110721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560550055110 + 110560550055111.

It is an arithmetic number, because the mean of its divisors is an integer number (110560550055111).

Almost surely, 2^{221121100110221} is an apocalyptic number.

It is an amenable number.

221121100110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121100110221 is an equidigital number, since it uses as much as digits as its factorization.

221121100110221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 221121100110221 its reverse (122011001121122), we get a palindrome (343132101231343).

The spelling of 221121100110221 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, one hundred million, one hundred ten thousand, two hundred twenty-one".