12121200012121 has 4 divisors (see below), whose sum is σ = 12159437236452. Its totient is φ = 12082962787792.

The previous prime is 12121200012091. The next prime is 12121200012149. The reversal of 12121200012121 is 12121000212121.

12121200012121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 5621351741721 + 6499848270400 = 2370939^2 + 2549480^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121200012121 - 2⁷ = 12121200011993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121200012095 and 12121200012104.

It is not an unprimeable number, because it can be changed into a prime (12121200012721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19118611690 + ... + 19118612323.

It is an arithmetic number, because the mean of its divisors is an integer number (3039859309113).

Almost surely, 2^{12121200012121} is an apocalyptic number.

It is an amenable number.

12121200012121 is a deficient number, since it is larger than the sum of its proper divisors (38237224331).

12121200012121 is an equidigital number, since it uses as much as digits as its factorization.

12121200012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38237224330.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 12121200012121 its reverse (12121000212121), we get a palindrome (24242200224242).

The spelling of 12121200012121 in words is "twelve trillion, one hundred twenty-one billion, two hundred million, twelve thousand, one hundred twenty-one".