10000000121 has 2 divisors, whose sum is σ = 10000000122. Its totient is φ = 10000000120.

The previous prime is 10000000103. The next prime is 10000000141. The reversal of 10000000121 is 12100000001.

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., 10000000000 + 121 = 100000^2 + 11^2 .

It is a cyclic number.

It is not a de Polignac number, because 10000000121 - 2¹⁴ = 9999983737 is a prime.

It is not a weakly prime, because it can be changed into another prime (10000000141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000000060 + 5000000061.

It is an arithmetic number, because the mean of its divisors is an integer number (5000000061).

Almost surely, 2^10000000121 is an apocalyptic number.

It is an amenable number.

10000000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

10000000121 is an equidigital number, since it uses as much as digits as its factorization.

10000000121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 10000000121 its reverse (12100000001), we get a palindrome (22100000122).

The spelling of 10000000121 in words is "ten billion, one hundred twenty-one", and thus it is an aban number.