121212020211121 has 8 divisors (see below), whose sum is σ = 138529346891904. Its totient is φ = 103895024478720.

The previous prime is 121212020211077. The next prime is 121212020211179. The reversal of 121212020211121 is 121112020212121.

It is a happy number.

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 121212020211121 - 2²¹ = 121212018113969 is a prime.

It is a super-3 number, since 3×121212020211121³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121212020211181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81951760 + ... + 83417713.

It is an arithmetic number, because the mean of its divisors is an integer number (17316168361488).

Almost surely, 2^{121212020211121} is an apocalyptic number.

It is an amenable number.

121212020211121 is a deficient number, since it is larger than the sum of its proper divisors (17317326680783).

121212020211121 is a wasteful number, since it uses less digits than its factorization.

121212020211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165474191.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121212020211121 its reverse (121112020212121), we get a palindrome (242324040423242).

The spelling of 121212020211121 in words is "one hundred twenty-one trillion, two hundred twelve billion, twenty million, two hundred eleven thousand, one hundred twenty-one".