221201000201221 has 2 divisors, whose sum is σ = 221201000201222. Its totient is φ = 221201000201220.

The previous prime is 221201000201179. The next prime is 221201000201231. The reversal of 221201000201221 is 122102000102122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219001669677025 + 2199330524196 = 14798705^2 + 1483014^2 .

It is a cyclic number.

It is not a de Polignac number, because 221201000201221 - 2²⁵ = 221200966646789 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221201000201195 and 221201000201204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221201000201231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600500100610 + 110600500100611.

It is an arithmetic number, because the mean of its divisors is an integer number (110600500100611).

Almost surely, 2^{221201000201221} is an apocalyptic number.

It is an amenable number.

221201000201221 is a deficient number, since it is larger than the sum of its proper divisors (1).

221201000201221 is an equidigital number, since it uses as much as digits as its factorization.

221201000201221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 221201000201221 its reverse (122102000102122), we get a palindrome (343303000303343).

Subtracting from 221201000201221 its reverse (122102000102122), we obtain a palindrome (99099000099099).

The spelling of 221201000201221 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred one thousand, two hundred twenty-one".