1231221443 has 2 divisors, whose sum is σ = 1231221444. Its totient is φ = 1231221442.

The previous prime is 1231221427. The next prime is 1231221449. The reversal of 1231221443 is 3441221321.

It is a strong prime.

It is an emirp because it is prime and its reverse (3441221321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1231221443 - 2⁴ = 1231221427 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1231221449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615610721 + 615610722.

It is an arithmetic number, because the mean of its divisors is an integer number (615610722).

Almost surely, 2^1231221443 is an apocalyptic number.

1231221443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231221443 is an equidigital number, since it uses as much as digits as its factorization.

1231221443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 23.

The square root of 1231221443 is about 35088.7651962847. The cubic root of 1231221443 is about 1071.7958148067.

Adding to 1231221443 its reverse (3441221321), we get a palindrome (4672442764).

The spelling of 1231221443 in words is "one billion, two hundred thirty-one million, two hundred twenty-one thousand, four hundred forty-three".