1231242213 has 4 divisors (see below), whose sum is σ = 1641656288. Its totient is φ = 820828140.

The previous prime is 1231242191. The next prime is 1231242223. The reversal of 1231242213 is 3122421321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1231242213 - 2⁹ = 1231241701 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231242213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231242223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205207033 + ... + 205207038.

It is an arithmetic number, because the mean of its divisors is an integer number (410414072).

Almost surely, 2^1231242213 is an apocalyptic number.

It is an amenable number.

1231242213 is a deficient number, since it is larger than the sum of its proper divisors (410414075).

1231242213 is an equidigital number, since it uses as much as digits as its factorization.

1231242213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410414074.

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

The square root of 1231242213 is about 35089.0611587144. The cubic root of 1231242213 is about 1071.8018416331.

Adding to 1231242213 its reverse (3122421321), we get a palindrome (4353663534).

The spelling of 1231242213 in words is "one billion, two hundred thirty-one million, two hundred forty-two thousand, two hundred thirteen".