1042221221 has 2 divisors, whose sum is σ = 1042221222. Its totient is φ = 1042221220.

The previous prime is 1042221163. The next prime is 1042221223. The reversal of 1042221221 is 1221222401.

1042221221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 588062500 + 454158721 = 24250^2 + 21311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1042221221 - 2¹⁸ = 1041959077 is a prime.

Together with 1042221223, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1042221221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1042221223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 521110610 + 521110611.

It is an arithmetic number, because the mean of its divisors is an integer number (521110611).

Almost surely, 2^1042221221 is an apocalyptic number.

It is an amenable number.

1042221221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1042221221 is an equidigital number, since it uses as much as digits as its factorization.

1042221221 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 1042221221 is about 32283.4511940716. The cubic root of 1042221221 is about 1013.8801892943.

Adding to 1042221221 its reverse (1221222401), we get a palindrome (2263443622).

The spelling of 1042221221 in words is "one billion, forty-two million, two hundred twenty-one thousand, two hundred twenty-one".