211201221120121 has 2 divisors, whose sum is σ = 211201221120122. Its totient is φ = 211201221120120.

The previous prime is 211201221120101. The next prime is 211201221120167. The reversal of 211201221120121 is 121021122102112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 208837499366521 + 2363721753600 = 14451211^2 + 1537440^2 .

It is a cyclic number.

It is not a de Polignac number, because 211201221120121 - 2⁵ = 211201221120089 is a prime.

It is a super-2 number, since 2×211201221120121² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211201221120101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105600610560060 + 105600610560061.

It is an arithmetic number, because the mean of its divisors is an integer number (105600610560061).

Almost surely, 2^{211201221120121} is an apocalyptic number.

It is an amenable number.

211201221120121 is a deficient number, since it is larger than the sum of its proper divisors (1).

211201221120121 is an equidigital number, since it uses as much as digits as its factorization.

211201221120121 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 19.

Adding to 211201221120121 its reverse (121021122102112), we get a palindrome (332222343222233).

The spelling of 211201221120121 in words is "two hundred eleven trillion, two hundred one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".