1212044221 has 2 divisors, whose sum is σ = 1212044222. Its totient is φ = 1212044220.

The previous prime is 1212044213. The next prime is 1212044321. The reversal of 1212044221 is 1224402121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 688275225 + 523768996 = 26235^2 + 22886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212044221 - 2³ = 1212044213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212044321) 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, 606022110 + 606022111.

It is an arithmetic number, because the mean of its divisors is an integer number (606022111).

Almost surely, 2^1212044221 is an apocalyptic number.

It is an amenable number.

1212044221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212044221 is an equidigital number, since it uses as much as digits as its factorization.

1212044221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 1212044221 is about 34814.4254727835. The cubic root of 1212044221 is about 1066.2019890817.

Adding to 1212044221 its reverse (1224402121), we get a palindrome (2436446342).

The spelling of 1212044221 in words is "one billion, two hundred twelve million, forty-four thousand, two hundred twenty-one".