2201221210121 has 2 divisors, whose sum is σ = 2201221210122. Its totient is φ = 2201221210120.

The previous prime is 2201221210103. The next prime is 2201221210147. The reversal of 2201221210121 is 1210121221022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1284060650896 + 917160559225 = 1133164^2 + 957685^2 .

It is a cyclic number.

It is not a de Polignac number, because 2201221210121 - 2¹⁸ = 2201220947977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2201221210121.

It is not a weakly prime, because it can be changed into another prime (2201221219121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1100610605060 + 1100610605061.

It is an arithmetic number, because the mean of its divisors is an integer number (1100610605061).

Almost surely, 2^{2201221210121} is an apocalyptic number.

It is an amenable number.

2201221210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2201221210121 is an equidigital number, since it uses as much as digits as its factorization.

2201221210121 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 2201221210121 its reverse (1210121221022), we get a palindrome (3411342431143).

The spelling of 2201221210121 in words is "two trillion, two hundred one billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".