11213231231 has 2 divisors, whose sum is σ = 11213231232. Its totient is φ = 11213231230.

The previous prime is 11213231219. The next prime is 11213231257. The reversal of 11213231231 is 13213231211.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11213231231 - 2¹⁴ = 11213214847 is a prime.

It is a super-2 number, since 2×11213231231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11213231201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5606615615 + 5606615616.

It is an arithmetic number, because the mean of its divisors is an integer number (5606615616).

Almost surely, 2^11213231231 is an apocalyptic number.

11213231231 is a deficient number, since it is larger than the sum of its proper divisors (1).

11213231231 is an equidigital number, since it uses as much as digits as its factorization.

11213231231 is an odious number, because the sum of its binary digits is odd.

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

Subtracting from 11213231231 its sum of digits (20), we obtain a palindrome (11213231211).

Adding to 11213231231 its reverse (13213231211), we get a palindrome (24426462442).

The spelling of 11213231231 in words is "eleven billion, two hundred thirteen million, two hundred thirty-one thousand, two hundred thirty-one".