2121200012 has 24 divisors (see below), whose sum is σ = 3883269600. Its totient is φ = 1012516736.
The previous prime is 2121199999. The next prime is 2121200021. The reversal of 2121200012 is 2100021212.
It is a happy number.
It is a junction number, because it is equal to n+sod(n) for n = 2121199966 and 2121200002.
It is an unprimeable number.
It is a pernicious number, because its binary representation contains a prime number (19) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92408 + ... + 113055.
It is an arithmetic number, because the mean of its divisors is an integer number (161802900).
Almost surely, 22121200012 is an apocalyptic number.
It is an amenable number.
2121200012 is a deficient number, since it is larger than the sum of its proper divisors (1762069588).
2121200012 is a wasteful number, since it uses less digits than its factorization.
2121200012 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 205585 (or 205583 counting only the distinct ones).
The product of its (nonzero) digits is 16, while the sum is 11.
The square root of 2121200012 is about 46056.4871869317. The cubic root of 2121200012 is about 1284.8739977487.
Adding to 2121200012 its reverse (2100021212), we get a palindrome (4221221224).
The spelling of 2121200012 in words is "two billion, one hundred twenty-one million, two hundred thousand, twelve".
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