1212000121021 has 2 divisors, whose sum is σ = 1212000121022. Its totient is φ = 1212000121020.

The previous prime is 1212000121019. The next prime is 1212000121091. The reversal of 1212000121021 is 1201210002121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 992535980121 + 219464140900 = 996261^2 + 468470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212000121021 - 2¹ = 1212000121019 is a prime.

Together with 1212000121019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1212000120992 and 1212000121010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212000121091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606000060510 + 606000060511.

It is an arithmetic number, because the mean of its divisors is an integer number (606000060511).

Almost surely, 2^{1212000121021} is an apocalyptic number.

It is an amenable number.

1212000121021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212000121021 is an equidigital number, since it uses as much as digits as its factorization.

1212000121021 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 13.

Adding to 1212000121021 its reverse (1201210002121), we get a palindrome (2413210123142).

The spelling of 1212000121021 in words is "one trillion, two hundred twelve billion, one hundred twenty-one thousand, twenty-one".