1242011205 has 32 divisors (see below), whose sum is σ = 2217801600. Its totient is φ = 659471616.

The previous prime is 1242011203. The next prime is 1242011213. The reversal of 1242011205 is 5021102421.

It is not a de Polignac number, because 1242011205 - 2¹ = 1242011203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242011203) 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 in 31 ways as a sum of consecutive naturals, for example, 10381 + ... + 50909.

It is an arithmetic number, because the mean of its divisors is an integer number (69306300).

Almost surely, 2^1242011205 is an apocalyptic number.

1242011205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1242011205 is a deficient number, since it is larger than the sum of its proper divisors (975790395).

1242011205 is a wasteful number, since it uses less digits than its factorization.

1242011205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40770 (or 40764 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 1242011205 is about 35242.1793452108. The cubic root of 1242011205 is about 1074.9175938274.

Adding to 1242011205 its reverse (5021102421), we get a palindrome (6263113626).

The spelling of 1242011205 in words is "one billion, two hundred forty-two million, eleven thousand, two hundred five".