10002220121 has 2 divisors, whose sum is σ = 10002220122. Its totient is φ = 10002220120.

The previous prime is 10002220117. The next prime is 10002220169. The reversal of 10002220121 is 12102220001.

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., 9694568521 + 307651600 = 98461^2 + 17540^2 .

It is a cyclic number.

It is not a de Polignac number, because 10002220121 - 2² = 10002220117 is a prime.

It is not a weakly prime, because it can be changed into another prime (10002220421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5001110060 + 5001110061.

It is an arithmetic number, because the mean of its divisors is an integer number (5001110061).

Almost surely, 2^10002220121 is an apocalyptic number.

It is an amenable number.

10002220121 is a deficient number, since it is larger than the sum of its proper divisors (1).

10002220121 is an equidigital number, since it uses as much as digits as its factorization.

10002220121 is an odious number, because the sum of its binary digits is odd.

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

Adding to 10002220121 its reverse (12102220001), we get a palindrome (22104440122).

The spelling of 10002220121 in words is "ten billion, two million, two hundred twenty thousand, one hundred twenty-one".