12121033213 has 4 divisors (see below), whose sum is σ = 12123786780. Its totient is φ = 12118279648.

The previous prime is 12121033187. The next prime is 12121033231. The reversal of 12121033213 is 31233012121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31233012121 = 7963 ⋅3922267.

It can be written as a sum of positive squares in 2 ways, for example, as 1577440089 + 10543593124 = 39717^2 + 102682^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121033213 - 2²¹ = 12118936061 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 (12121033913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1370170 + ... + 1378987.

It is an arithmetic number, because the mean of its divisors is an integer number (3030946695).

Almost surely, 2^12121033213 is an apocalyptic number.

It is an amenable number.

12121033213 is a deficient number, since it is larger than the sum of its proper divisors (2753567).

12121033213 is an equidigital number, since it uses as much as digits as its factorization.

12121033213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2753566.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 12121033213 its reverse (31233012121), we get a palindrome (43354045334).

The spelling of 12121033213 in words is "twelve billion, one hundred twenty-one million, thirty-three thousand, two hundred thirteen".