1211042443 has 8 divisors (see below), whose sum is σ = 1304469936. Its totient is φ = 1117653600.

The previous prime is 1211042423. The next prime is 1211042473. The reversal of 1211042443 is 3442401121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211042443 - 2²¹ = 1208945291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211042423) 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 7 ways as a sum of consecutive naturals, for example, 116853 + ... + 126793.

It is an arithmetic number, because the mean of its divisors is an integer number (163058742).

Almost surely, 2^1211042443 is an apocalyptic number.

1211042443 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1211042443 is a deficient number, since it is larger than the sum of its proper divisors (93427493).

1211042443 is an equidigital number, since it uses as much as digits as its factorization.

1211042443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19325.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1211042443 is about 34800.0351005570. The cubic root of 1211042443 is about 1065.9081625912.

Adding to 1211042443 its reverse (3442401121), we get a palindrome (4653443564).

The spelling of 1211042443 in words is "one billion, two hundred eleven million, forty-two thousand, four hundred forty-three".