1212210121021 has 8 divisors (see below), whose sum is σ = 1280413992704.
Its totient is φ = 1145825019360.
The previous prime is 1212210121009. The next prime is 1212210121037. The reversal of 1212210121021 is 1201210122121.
Adding to 1212210121021 its reverse (1201210122121), we get a palindrome (2413420243142).
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 1212210121021 - 215 = 1212210088253 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 1212210120986 and 1212210121004.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1212210121321) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454691136 + ... + 454693801.
It is an arithmetic number, because the mean of its divisors is an integer number (160051749088).
Almost surely, 21212210121021 is an apocalyptic number.
It is an amenable number.
1212210121021 is a deficient number, since it is larger than the sum of its proper divisors (68203871683).
1212210121021 is an equidigital number, since it uses as much as digits as its factorization.
1212210121021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 909385011.
The product of its (nonzero) digits is 32, while the sum is 16.
The spelling of 1212210121021 in words is "one trillion, two hundred twelve billion, two hundred ten million, one hundred twenty-one thousand, twenty-one".