21120010000121 has 2 divisors, whose sum is σ = 21120010000122. Its totient is φ = 21120010000120.

The previous prime is 21120010000097. The next prime is 21120010000169. The reversal of 21120010000121 is 12100001002112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20958999610000 + 161010390121 = 4578100^2 + 401261^2 .

It is a cyclic number.

It is not a de Polignac number, because 21120010000121 - 2⁴² = 16721963489017 is a prime.

It is a super-2 number, since 2×21120010000121² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21120010000171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560005000060 + 10560005000061.

It is an arithmetic number, because the mean of its divisors is an integer number (10560005000061).

Almost surely, 2^{21120010000121} is an apocalyptic number.

It is an amenable number.

21120010000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120010000121 is an equidigital number, since it uses as much as digits as its factorization.

21120010000121 is an evil number, because the sum of its binary digits is even.

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

Adding to 21120010000121 its reverse (12100001002112), we get a palindrome (33220011002233).

The spelling of 21120010000121 in words is "twenty-one trillion, one hundred twenty billion, ten million, one hundred twenty-one", and thus it is an aban number.