1212123302221 has 32 divisors (see below), whose sum is σ = 1383654434400. Its totient is φ = 1053691269120.

The previous prime is 1212123302219. The next prime is 1212123302251. The reversal of 1212123302221 is 1222033212121.

It can be written as a sum of positive squares in 16 ways, for example, as 933376260996 + 278747041225 = 966114^2 + 527965^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212123302221 - 2¹ = 1212123302219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1212123302192 and 1212123302201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212123302251) 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 in 31 ways as a sum of consecutive naturals, for example, 88669975 + ... + 88683643.

It is an arithmetic number, because the mean of its divisors is an integer number (43239201075).

Almost surely, 2^{1212123302221} is an apocalyptic number.

It is an amenable number.

1212123302221 is a deficient number, since it is larger than the sum of its proper divisors (171531132179).

1212123302221 is a wasteful number, since it uses less digits than its factorization.

1212123302221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19489.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 1212123302221 its reverse (1222033212121), we get a palindrome (2434156514342).

The spelling of 1212123302221 in words is "one trillion, two hundred twelve billion, one hundred twenty-three million, three hundred two thousand, two hundred twenty-one".