12121220213 has 4 divisors (see below), whose sum is σ = 12121476108. Its totient is φ = 12120964320.

The previous prime is 12121220207. The next prime is 12121220231. The reversal of 12121220213 is 31202212121.

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 543029809 + 11578190404 = 23303^2 + 107602^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121220213 - 2⁶ = 12121220149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121220191 and 12121220200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121220203) 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, 33806 + ... + 159327.

It is an arithmetic number, because the mean of its divisors is an integer number (3030369027).

Almost surely, 2^12121220213 is an apocalyptic number.

It is an amenable number.

12121220213 is a deficient number, since it is larger than the sum of its proper divisors (255895).

12121220213 is an equidigital number, since it uses as much as digits as its factorization.

12121220213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255894.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 12121220213 its reverse (31202212121), we get a palindrome (43323432334).

The spelling of 12121220213 in words is "twelve billion, one hundred twenty-one million, two hundred twenty thousand, two hundred thirteen".