2201220121 has 2 divisors, whose sum is σ = 2201220122. Its totient is φ = 2201220120.

The previous prime is 2201220079. The next prime is 2201220139. The reversal of 2201220121 is 1210221022.

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., 1604883721 + 596336400 = 40061^2 + 24420^2 .

It is a cyclic number.

It is not a de Polignac number, because 2201220121 - 2⁹ = 2201219609 is a prime.

It is not a weakly prime, because it can be changed into another prime (2201224121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1100610060 + 1100610061.

It is an arithmetic number, because the mean of its divisors is an integer number (1100610061).

Almost surely, 2^2201220121 is an apocalyptic number.

It is an amenable number.

2201220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2201220121 is an equidigital number, since it uses as much as digits as its factorization.

2201220121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2201220121 is about 46917.1623289389. The cubic root of 2201220121 is about 1300.8318386189.

Adding to 2201220121 its reverse (1210221022), we get a palindrome (3411441143).

Subtracting from 2201220121 its reverse (1210221022), we obtain a palindrome (990999099).

The spelling of 2201220121 in words is "two billion, two hundred one million, two hundred twenty thousand, one hundred twenty-one".