12121021130021 has 4 divisors (see below), whose sum is σ = 12228286803852. Its totient is φ = 12013755456192.

The previous prime is 12121021130017. The next prime is 12121021130041. The reversal of 12121021130021 is 12003112012121.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6109276173025 + 6011744956996 = 2471695^2 + 2451886^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121021130021 - 2² = 12121021130017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121021130041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53632836746 + ... + 53632836971.

It is an arithmetic number, because the mean of its divisors is an integer number (3057071700963).

Almost surely, 2^{12121021130021} is an apocalyptic number.

It is an amenable number.

12121021130021 is a deficient number, since it is larger than the sum of its proper divisors (107265673831).

12121021130021 is a wasteful number, since it uses less digits than its factorization.

12121021130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107265673830.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 12121021130021 its reverse (12003112012121), we get a palindrome (24124133142142).

The spelling of 12121021130021 in words is "twelve trillion, one hundred twenty-one billion, twenty-one million, one hundred thirty thousand, twenty-one".