12000021012121 has 2 divisors, whose sum is σ = 12000021012122. Its totient is φ = 12000021012120.

The previous prime is 12000021012071. The next prime is 12000021012127. The reversal of 12000021012121 is 12121012000021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10855634554521 + 1144386457600 = 3294789^2 + 1069760^2 .

It is a cyclic number.

It is not a de Polignac number, because 12000021012121 - 2²⁷ = 11999886794393 is a prime.

It is not a weakly prime, because it can be changed into another prime (12000021012127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6000010506060 + 6000010506061.

It is an arithmetic number, because the mean of its divisors is an integer number (6000010506061).

Almost surely, 2^{12000021012121} is an apocalyptic number.

It is an amenable number.

12000021012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12000021012121 is an equidigital number, since it uses as much as digits as its factorization.

12000021012121 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 13.

Adding to 12000021012121 its reverse (12121012000021), we get a palindrome (24121033012142).

The spelling of 12000021012121 in words is "twelve trillion, twenty-one million, twelve thousand, one hundred twenty-one".