2121200021212 has 24 divisors (see below), whose sum is σ = 3931200707616.
Its totient is φ = 998023369728.
The previous prime is 2121200021147. The next prime is 2121200021219.
It is a happy number.
2121200021212 is nontrivially palindromic in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (2121200021219) 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, 2580573 + ... + 3301780.
It is an arithmetic number, because the mean of its divisors is an integer number (163800029484).
Almost surely, 22121200021212 is an apocalyptic number.
It is an amenable number.
2121200021212 is a deficient number, since it is larger than the sum of its proper divisors (1810000686404).
2121200021212 is a wasteful number, since it uses less digits than its factorization.
2121200021212 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 5887677 (or 5887675 counting only the distinct ones).
The product of its (nonzero) digits is 64, while the sum is 16.
It can be divided in two parts, 21212000 and 21212, that added together give a palindrome (21233212).
The spelling of 2121200021212 in words is "two trillion, one hundred twenty-one billion, two hundred million, twenty-one thousand, two hundred twelve".