11213123213 has 2 divisors, whose sum is σ = 11213123214. Its totient is φ = 11213123212.

The previous prime is 11213123191. The next prime is 11213123263. The reversal of 11213123213 is 31232131211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8549221444 + 2663901769 = 92462^2 + 51613^2 .

It is a cyclic number.

It is not a de Polignac number, because 11213123213 - 2⁸ = 11213122957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11213123263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606561606 + 5606561607.

It is an arithmetic number, because the mean of its divisors is an integer number (5606561607).

Almost surely, 2^11213123213 is an apocalyptic number.

It is an amenable number.

11213123213 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213123213 is an equidigital number, since it uses as much as digits as its factorization.

11213123213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

Adding to 11213123213 its reverse (31232131211), we get a palindrome (42445254424).

The spelling of 11213123213 in words is "eleven billion, two hundred thirteen million, one hundred twenty-three thousand, two hundred thirteen".