11131212013 has 16 divisors (see below), whose sum is σ = 11663034480. Its totient is φ = 10610016256.

The previous prime is 11131211989. The next prime is 11131212019. The reversal of 11131212013 is 31021213111.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 10876804 + 11120335209 = 3298^2 + 105453^2 .

It is a cyclic number.

It is not a de Polignac number, because 11131212013 - 2⁵ = 11131211981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131212019) 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 in 15 ways as a sum of consecutive naturals, for example, 835581 + ... + 848797.

It is an arithmetic number, because the mean of its divisors is an integer number (728939655).

Almost surely, 2^11131212013 is an apocalyptic number.

It is an amenable number.

11131212013 is a deficient number, since it is larger than the sum of its proper divisors (531822467).

11131212013 is a wasteful number, since it uses less digits than its factorization.

11131212013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13616.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 11131212013 its reverse (31021213111), we get a palindrome (42152425124).

The spelling of 11131212013 in words is "eleven billion, one hundred thirty-one million, two hundred twelve thousand, thirteen".