12101120021 has 2 divisors, whose sum is σ = 12101120022. Its totient is φ = 12101120020.

The previous prime is 12101119997. The next prime is 12101120039. The reversal of 12101120021 is 12002110121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9362691121 + 2738428900 = 96761^2 + 52330^2 .

It is an emirp because it is prime and its reverse (12002110121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12101120021 - 2⁶ = 12101119957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12101119984 and 12101120011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12101120321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050560010 + 6050560011.

It is an arithmetic number, because the mean of its divisors is an integer number (6050560011).

Almost surely, 2^12101120021 is an apocalyptic number.

It is an amenable number.

12101120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12101120021 is an equidigital number, since it uses as much as digits as its factorization.

12101120021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 12101120021 its reverse (12002110121), we get a palindrome (24103230142).

The spelling of 12101120021 in words is "twelve billion, one hundred one million, one hundred twenty thousand, twenty-one".