20123120131 has 4 divisors (see below), whose sum is σ = 20166210792. Its totient is φ = 20080029472.

The previous prime is 20123120119. The next prime is 20123120219. The reversal of 20123120131 is 13102132102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13102132102 = 2 ⋅6551066051.

It is a cyclic number.

It is not a de Polignac number, because 20123120131 - 2⁹ = 20123119619 is a prime.

It is a super-2 number, since 2×20123120131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123120231) 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, 21544630 + ... + 21545563.

It is an arithmetic number, because the mean of its divisors is an integer number (5041552698).

Almost surely, 2^20123120131 is an apocalyptic number.

20123120131 is a deficient number, since it is larger than the sum of its proper divisors (43090661).

20123120131 is an equidigital number, since it uses as much as digits as its factorization.

20123120131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43090660.

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

Adding to 20123120131 its reverse (13102132102), we get a palindrome (33225252233).

The spelling of 20123120131 in words is "twenty billion, one hundred twenty-three million, one hundred twenty thousand, one hundred thirty-one".