10321121221 has 2 divisors, whose sum is σ = 10321121222.
Its totient is φ = 10321121220.
The previous prime is 10321121201. The next prime is 10321121267. The reversal of 10321121221 is 12212112301.
Adding to 10321121221 its reverse (12212112301), we get a palindrome (22533233522).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 5419020996 + 4902100225 = 73614^2 + 70015^2
It is a cyclic number.
It is not a de Polignac number, because 10321121221 - 27 = 10321121093 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 10321121195 and 10321121204.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (10321121201) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5160560610 + 5160560611.
It is an arithmetic number, because the mean of its divisors is an integer number (5160560611).
Almost surely, 210321121221 is an apocalyptic number.
It is an amenable number.
10321121221 is a deficient number, since it is larger than the sum of its proper divisors (1).
10321121221 is an equidigital number, since it uses as much as digits as its factorization.
10321121221 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 48, while the sum is 16.
The spelling of 10321121221 in words is "ten billion, three hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-one".