12121112213 has 12 divisors (see below), whose sum is σ = 14118887232. Its totient is φ = 10375659000.

The previous prime is 12121112207. The next prime is 12121112239. The reversal of 12121112213 is 31221112121.

It is a happy number.

It is not a de Polignac number, because 12121112213 - 2⁴ = 12121112197 is a prime.

It is a super-2 number, since 2×12121112213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121112191 and 12121112200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121112713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 127895 + ... + 201492.

It is an arithmetic number, because the mean of its divisors is an integer number (1176573936).

Almost surely, 2^12121112213 is an apocalyptic number.

It is an amenable number.

12121112213 is a deficient number, since it is larger than the sum of its proper divisors (1997775019).

12121112213 is an equidigital number, since it uses as much as digits as its factorization.

12121112213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330152 (or 330145 counting only the distinct ones).

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

Adding to 12121112213 its reverse (31221112121), we get a palindrome (43342224334).

The spelling of 12121112213 in words is "twelve billion, one hundred twenty-one million, one hundred twelve thousand, two hundred thirteen".