1001221000121 has 2 divisors, whose sum is σ = 1001221000122. Its totient is φ = 1001221000120.

The previous prime is 1001221000079. The next prime is 1001221000141. The reversal of 1001221000121 is 1210001221001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 893045790121 + 108175210000 = 945011^2 + 328900^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001221000121 - 2¹⁸ = 1001220737977 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001221000141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500610500060 + 500610500061.

It is an arithmetic number, because the mean of its divisors is an integer number (500610500061).

Almost surely, 2^{1001221000121} is an apocalyptic number.

It is an amenable number.

1001221000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001221000121 is an equidigital number, since it uses as much as digits as its factorization.

1001221000121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1001221000121 its reverse (1210001221001), we get a palindrome (2211222221122).

The spelling of 1001221000121 in words is "one trillion, one billion, two hundred twenty-one million, one hundred twenty-one", and thus it is an aban number.