11131121213 has 2 divisors, whose sum is σ = 11131121214. Its totient is φ = 11131121212.

The previous prime is 11131121203. The next prime is 11131121257. The reversal of 11131121213 is 31212113111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8705263204 + 2425858009 = 93302^2 + 49253^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131121213 - 2⁶ = 11131121149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11131121191 and 11131121200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11131121203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5565560606 + 5565560607.

It is an arithmetic number, because the mean of its divisors is an integer number (5565560607).

Almost surely, 2^11131121213 is an apocalyptic number.

It is an amenable number.

11131121213 is a deficient number, since it is larger than the sum of its proper divisors (1).

11131121213 is an equidigital number, since it uses as much as digits as its factorization.

11131121213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36, while the sum is 17.

Adding to 11131121213 its reverse (31212113111), we get a palindrome (42343234324).

The spelling of 11131121213 in words is "eleven billion, one hundred thirty-one million, one hundred twenty-one thousand, two hundred thirteen".