11123031213 has 36 divisors (see below), whose sum is σ = 19381951680. Its totient is φ = 6356011032.

The previous prime is 11123031211. The next prime is 11123031251. The reversal of 11123031213 is 31213032111.

11123031213 is a `hidden beast` number, since 111 + 230 + 312 + 13 = 666.

It is not a de Polignac number, because 11123031213 - 2¹ = 11123031211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123031211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 455173 + ... + 478986.

Almost surely, 2^11123031213 is an apocalyptic number.

It is an amenable number.

11123031213 is a deficient number, since it is larger than the sum of its proper divisors (8258920467).

11123031213 is an frugal number, since it uses more digits than its factorization.

11123031213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934188 (or 934169 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 11123031213 its reverse (31213032111), we get a palindrome (42336063324).

The spelling of 11123031213 in words is "eleven billion, one hundred twenty-three million, thirty-one thousand, two hundred thirteen".