1242242105 has 24 divisors (see below), whose sum is σ = 1709151192. Its totient is φ = 863376384.

The previous prime is 1242242081. The next prime is 1242242129. The reversal of 1242242105 is 5012422421.

It is an interprime number because it is at equal distance from previous prime (1242242081) and next prime (1242242129).

It can be written as a sum of positive squares in 12 ways, for example, as 917665849 + 324576256 = 30293^2 + 18016^2 .

It is not a de Polignac number, because 1242242105 - 2⁶ = 1242242041 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 28874 + ... + 57603.

It is an arithmetic number, because the mean of its divisors is an integer number (71214633).

Almost surely, 2^1242242105 is an apocalyptic number.

It is an amenable number.

1242242105 is a deficient number, since it is larger than the sum of its proper divisors (466909087).

1242242105 is a wasteful number, since it uses less digits than its factorization.

1242242105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86525 (or 86512 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 1242242105 is about 35245.4550970760. The cubic root of 1242242105 is about 1074.9842016788.

Adding to 1242242105 its reverse (5012422421), we get a palindrome (6254664526).

The spelling of 1242242105 in words is "one billion, two hundred forty-two million, two hundred forty-two thousand, one hundred five".