121212121013 has 4 divisors (see below), whose sum is σ = 121300405068. Its totient is φ = 121123836960.

The previous prime is 121212121007. The next prime is 121212121153. The reversal of 121212121013 is 310121212121.

It is a happy number.

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 116258495089 + 4953625924 = 340967^2 + 70382^2 .

It is a cyclic number.

It is not a de Polignac number, because 121212121013 - 2¹⁸ = 121211858869 is a prime.

It is a super-2 number, since 2×121212121013² (a number of 23 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 = 121212120982 and 121212121000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121212120013) 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, 44139968 + ... + 44142713.

It is an arithmetic number, because the mean of its divisors is an integer number (30325101267).

Almost surely, 2^121212121013 is an apocalyptic number.

It is an amenable number.

121212121013 is a deficient number, since it is larger than the sum of its proper divisors (88284055).

121212121013 is an equidigital number, since it uses as much as digits as its factorization.

121212121013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88284054.

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

Adding to 121212121013 its reverse (310121212121), we get a palindrome (431333333134).

The spelling of 121212121013 in words is "one hundred twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, thirteen".