2221000121 has 2 divisors, whose sum is σ = 2221000122. Its totient is φ = 2221000120.

The previous prime is 2221000099. The next prime is 2221000141. The reversal of 2221000121 is 1210001222.

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., 2201955625 + 19044496 = 46925^2 + 4364^2 .

It is a cyclic number.

It is not a de Polignac number, because 2221000121 - 2¹⁰ = 2220999097 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2221000141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110500060 + 1110500061.

It is an arithmetic number, because the mean of its divisors is an integer number (1110500061).

Almost surely, 2^2221000121 is an apocalyptic number.

It is an amenable number.

2221000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221000121 is an equidigital number, since it uses as much as digits as its factorization.

2221000121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 2221000121 is about 47127.4879555446. The cubic root of 2221000121 is about 1304.7166182974.

Adding to 2221000121 its reverse (1210001222), we get a palindrome (3431001343).

The spelling of 2221000121 in words is "two billion, two hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.