121212112013 has 8 divisors (see below), whose sum is σ = 121328623416. Its totient is φ = 121095648000.

The previous prime is 121212112001. The next prime is 121212112019. The reversal of 121212112013 is 310211212121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 70310886244 + 50901225769 = 265162^2 + 225613^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121212112013 - 2¹⁰ = 121212110989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121212111982 and 121212112000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212112019) 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 7 ways as a sum of consecutive naturals, for example, 6957113 + ... + 6974513.

It is an arithmetic number, because the mean of its divisors is an integer number (15166077927).

Almost surely, 2^121212112013 is an apocalyptic number.

It is an amenable number.

121212112013 is a deficient number, since it is larger than the sum of its proper divisors (116511403).

121212112013 is a wasteful number, since it uses less digits than its factorization.

121212112013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23695.

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

Adding to 121212112013 its reverse (310211212121), we get a palindrome (431423324134).

The spelling of 121212112013 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twelve thousand, thirteen".