1242303221 has 2 divisors, whose sum is σ = 1242303222. Its totient is φ = 1242303220.

The previous prime is 1242303197. The next prime is 1242303241. The reversal of 1242303221 is 1223032421.

It is an a-pointer prime, because the next prime (1242303241) can be obtained adding 1242303221 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 701508196 + 540795025 = 26486^2 + 23255^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242303221 - 2²² = 1238108917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1242303193 and 1242303202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242303241) 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, 621151610 + 621151611.

It is an arithmetic number, because the mean of its divisors is an integer number (621151611).

Almost surely, 2^1242303221 is an apocalyptic number.

It is an amenable number.

1242303221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242303221 is an equidigital number, since it uses as much as digits as its factorization.

1242303221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1242303221 is about 35246.3220918155. The cubic root of 1242303221 is about 1075.0018304638.

Adding to 1242303221 its reverse (1223032421), we get a palindrome (2465335642).

The spelling of 1242303221 in words is "one billion, two hundred forty-two million, three hundred three thousand, two hundred twenty-one".