2012122121 has 4 divisors (see below), whose sum is σ = 2012276244.
Its totient is φ = 2011968000.
The previous prime is 2012122117. The next prime is 2012122127. The reversal of 2012122121 is 1212212102.
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 1900524025 + 111598096 = 43595^2 + 10564^2
It is a cyclic number.
It is not a de Polignac number, because 2012122121 - 22 = 2012122117 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 2012122096 and 2012122105.
It is not an unprimeable number, because it can be changed into a prime (2012122127) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55460 + ... + 84261.
It is an arithmetic number, because the mean of its divisors is an integer number (503069061).
Almost surely, 22012122121 is an apocalyptic number.
It is an amenable number.
2012122121 is a deficient number, since it is larger than the sum of its proper divisors (154123).
2012122121 is a wasteful number, since it uses less digits than its factorization.
2012122121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 154122.
The product of its (nonzero) digits is 32, while the sum is 14.
The square root of 2012122121 is about 44856.6842399213.
The cubic root of 2012122121 is about 1262.4614102638.
Adding to 2012122121 its reverse (1212212102), we get a palindrome (3224334223).
The spelling of 2012122121 in words is "two billion, twelve million, one hundred twenty-two thousand, one hundred twenty-one".