2012131123 has 4 divisors (see below), whose sum is σ = 2012420808. Its totient is φ = 2011841440.

The previous prime is 2012131117. The next prime is 2012131127. The reversal of 2012131123 is 3211312102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2012131123 - 2⁵ = 2012131091 is a prime.

It is a super-2 number, since 2×2012131123² = 8097343312290482258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2012131097 and 2012131106.

It is not an unprimeable number, because it can be changed into a prime (2012131127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134161 + ... + 148402.

It is an arithmetic number, because the mean of its divisors is an integer number (503105202).

Almost surely, 2^2012131123 is an apocalyptic number.

2012131123 is a deficient number, since it is larger than the sum of its proper divisors (289685).

2012131123 is an equidigital number, since it uses as much as digits as its factorization.

2012131123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289684.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2012131123 is about 44856.7845815992. The cubic root of 2012131123 is about 1262.4632929628.

Adding to 2012131123 its reverse (3211312102), we get a palindrome (5223443225).

The spelling of 2012131123 in words is "two billion, twelve million, one hundred thirty-one thousand, one hundred twenty-three".