12121221011 has 2 divisors, whose sum is σ = 12121221012.
Its totient is φ = 12121221010.
The previous prime is 12121220963. The next prime is 12121221041. The reversal of 12121221011 is 11012212121.
Adding to 12121221011 its reverse (11012212121), we get a palindrome (23133433132).
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 12121221011 - 222 = 12117026707 is a prime.
It is not a weakly prime, because it can be changed into another prime (12121221041) by changing a digit.
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 as a sum of consecutive naturals, namely, 6060610505 + 6060610506.
It is an arithmetic number, because the mean of its divisors is an integer number (6060610506).
Almost surely, 212121221011 is an apocalyptic number.
12121221011 is a deficient number, since it is larger than the sum of its proper divisors (1).
12121221011 is an equidigital number, since it uses as much as digits as its factorization.
12121221011 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 16, while the sum is 14.
The spelling of 12121221011 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, eleven".