1231224213 has 16 divisors (see below), whose sum is σ = 1671370560. Its totient is φ = 805979136.

The previous prime is 1231224143. The next prime is 1231224223. The reversal of 1231224213 is 3124221321.

It is not a de Polignac number, because 1231224213 - 2⁹ = 1231223701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1231224213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231224223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172981 + ... + 179957.

It is an arithmetic number, because the mean of its divisors is an integer number (104460660).

Almost surely, 2^1231224213 is an apocalyptic number.

It is an amenable number.

1231224213 is a deficient number, since it is larger than the sum of its proper divisors (440146347).

1231224213 is an equidigital number, since it uses as much as digits as its factorization.

1231224213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8036.

The product of its digits is 576, while the sum is 21.

The square root of 1231224213 is about 35088.8046675859. The cubic root of 1231224213 is about 1071.7966185809.

Adding to 1231224213 its reverse (3124221321), we get a palindrome (4355445534).

The spelling of 1231224213 in words is "one billion, two hundred thirty-one million, two hundred twenty-four thousand, two hundred thirteen".