123312112011 has 12 divisors (see below), whose sum is σ = 194309994840. Its totient is φ = 74734613280.

The previous prime is 123312111977. The next prime is 123312112043. The reversal of 123312112011 is 110211213321.

It is not a de Polignac number, because 123312112011 - 2⁶ = 123312111947 is a prime.

It is a super-2 number, since 2×123312112011² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123312112411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 622788346 + ... + 622788543.

It is an arithmetic number, because the mean of its divisors is an integer number (16192499570).

Almost surely, 2^123312112011 is an apocalyptic number.

123312112011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

123312112011 is a deficient number, since it is larger than the sum of its proper divisors (70997882829).

123312112011 is a wasteful number, since it uses less digits than its factorization.

123312112011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245576906 (or 1245576903 counting only the distinct ones).

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

Adding to 123312112011 its reverse (110211213321), we get a palindrome (233523325332).

The spelling of 123312112011 in words is "one hundred twenty-three billion, three hundred twelve million, one hundred twelve thousand, eleven".