1012200121 has 2 divisors, whose sum is σ = 1012200122.
Its totient is φ = 1012200120.
The previous prime is 1012200113. The next prime is 1012200139. The reversal of 1012200121 is 1210022101.
Adding to 1012200121 its reverse (1210022101), we get a palindrome (2222222222).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 950797225 + 61402896 = 30835^2 + 7836^2
It is a cyclic number.
It is not a de Polignac number, because 1012200121 - 23 = 1012200113 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 1012200098 and 1012200107.
It is not a weakly prime, because it can be changed into another prime (1012200191) 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 as a sum of consecutive naturals, namely, 506100060 + 506100061.
It is an arithmetic number, because the mean of its divisors is an integer number (506100061).
Almost surely, 21012200121 is an apocalyptic number.
It is an amenable number.
1012200121 is a deficient number, since it is larger than the sum of its proper divisors (1).
1012200121 is an equidigital number, since it uses as much as digits as its factorization.
1012200121 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 8, while the sum is 10.
The square root of 1012200121 is about 31815.0926605597.
The cubic root of 1012200121 is about 1004.0502800833.
The spelling of 1012200121 in words is "one billion, twelve million, two hundred thousand, one hundred twenty-one".