11123021531213 has 16 divisors (see below), whose sum is σ = 12046662952704. Its totient is φ = 10230002442240.

The previous prime is 11123021531161. The next prime is 11123021531243. The reversal of 11123021531213 is 31213512032111.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11123021531213 - 2¹⁸ = 11123021269069 is a prime.

It is a super-2 number, since 2×11123021531213² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123021531243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10346795 + ... + 11371112.

It is an arithmetic number, because the mean of its divisors is an integer number (752916434544).

Almost surely, 2^{11123021531213} is an apocalyptic number.

It is an amenable number.

11123021531213 is a deficient number, since it is larger than the sum of its proper divisors (923641421491).

11123021531213 is a wasteful number, since it uses less digits than its factorization.

11123021531213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21718612.

The product of its (nonzero) digits is 1080, while the sum is 26.

Adding to 11123021531213 its reverse (31213512032111), we get a palindrome (42336533563324).

The spelling of 11123021531213 in words is "eleven trillion, one hundred twenty-three billion, twenty-one million, five hundred thirty-one thousand, two hundred thirteen".