11123212131 has 24 divisors (see below), whose sum is σ = 16934514480. Its totient is φ = 7024670016.

The previous prime is 11123212127. The next prime is 11123212141. The reversal of 11123212131 is 13121232111.

It is not a de Polignac number, because 11123212131 - 2² = 11123212127 is a prime.

It is a super-2 number, since 2×11123212131² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11123212141) 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 23 ways as a sum of consecutive naturals, for example, 388221 + ... + 415886.

It is an arithmetic number, because the mean of its divisors is an integer number (705604770).

Almost surely, 2^11123212131 is an apocalyptic number.

11123212131 is a deficient number, since it is larger than the sum of its proper divisors (5811302349).

11123212131 is a wasteful number, since it uses less digits than its factorization.

11123212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804195 (or 804192 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 11123212131 its reverse (13121232111), we get a palindrome (24244444242).

The spelling of 11123212131 in words is "eleven billion, one hundred twenty-three million, two hundred twelve thousand, one hundred thirty-one".