201221210022101 has 2 divisors, whose sum is σ = 201221210022102. Its totient is φ = 201221210022100.

The previous prime is 201221210022023. The next prime is 201221210022137. The reversal of 201221210022101 is 101220012122102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101266504891876 + 99954705130225 = 10063126^2 + 9997735^2 .

It is a cyclic number.

It is not a de Polignac number, because 201221210022101 - 2²² = 201221205827797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201221210022101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201221210022181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100610605011050 + 100610605011051.

It is an arithmetic number, because the mean of its divisors is an integer number (100610605011051).

Almost surely, 2^{201221210022101} is an apocalyptic number.

It is an amenable number.

201221210022101 is a deficient number, since it is larger than the sum of its proper divisors (1).

201221210022101 is an equidigital number, since it uses as much as digits as its factorization.

201221210022101 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 17.

Adding to 201221210022101 its reverse (101220012122102), we get a palindrome (302441222144203).

The spelling of 201221210022101 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred ten million, twenty-two thousand, one hundred one".