12121210112021 has 2 divisors, whose sum is σ = 12121210112022. Its totient is φ = 12121210112020.

The previous prime is 12121210111991. The next prime is 12121210112083. The reversal of 12121210112021 is 12021101212121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10516491211396 + 1604718900625 = 3242914^2 + 1266775^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121210112021 - 2⁶ = 12121210111957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121210132021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060605056010 + 6060605056011.

It is an arithmetic number, because the mean of its divisors is an integer number (6060605056011).

Almost surely, 2^{12121210112021} is an apocalyptic number.

It is an amenable number.

12121210112021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121210112021 is an equidigital number, since it uses as much as digits as its factorization.

12121210112021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 12121210112021 its reverse (12021101212121), we get a palindrome (24142311324142).

The spelling of 12121210112021 in words is "twelve trillion, one hundred twenty-one billion, two hundred ten million, one hundred twelve thousand, twenty-one".