1204041221 has 2 divisors, whose sum is σ = 1204041222. Its totient is φ = 1204041220.

The previous prime is 1204041199. The next prime is 1204041259. The reversal of 1204041221 is 1221404021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1191009121 + 13032100 = 34511^2 + 3610^2 .

It is an emirp because it is prime and its reverse (1221404021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1204041221 - 2¹⁴ = 1204024837 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1204041221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1204041281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 602020610 + 602020611.

It is an arithmetic number, because the mean of its divisors is an integer number (602020611).

Almost surely, 2^1204041221 is an apocalyptic number.

It is an amenable number.

1204041221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1204041221 is an equidigital number, since it uses as much as digits as its factorization.

1204041221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 1204041221 is about 34699.2971254462. The cubic root of 1204041221 is about 1063.8501320588.

Adding to 1204041221 its reverse (1221404021), we get a palindrome (2425445242).

The spelling of 1204041221 in words is "one billion, two hundred four million, forty-one thousand, two hundred twenty-one".