20131212123 has 40 divisors (see below), whose sum is σ = 33425487216. Its totient is φ = 11970504000.

The previous prime is 20131212103. The next prime is 20131212163. The reversal of 20131212123 is 32121213102.

It is not a de Polignac number, because 20131212123 - 2¹⁷ = 20131081051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20131212096 and 20131212105.

It is not an unprimeable number, because it can be changed into a prime (20131212103) 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 39 ways as a sum of consecutive naturals, for example, 165928 + ... + 260373.

Almost surely, 2^20131212123 is an apocalyptic number.

20131212123 is a deficient number, since it is larger than the sum of its proper divisors (13294275093).

20131212123 is a wasteful number, since it uses less digits than its factorization.

20131212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426377 (or 426368 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 20131212123 its reverse (32121213102), we get a palindrome (52252425225).

The spelling of 20131212123 in words is "twenty billion, one hundred thirty-one million, two hundred twelve thousand, one hundred twenty-three".