20125133123 has 4 divisors (see below), whose sum is σ = 20155672680. Its totient is φ = 20094593568.

The previous prime is 20125133057. The next prime is 20125133131. The reversal of 20125133123 is 32133152102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32133152102 = 2 ⋅16066576051.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20125133123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20125133143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15268790 + ... + 15270107.

It is an arithmetic number, because the mean of its divisors is an integer number (5038918170).

Almost surely, 2^20125133123 is an apocalyptic number.

20125133123 is a deficient number, since it is larger than the sum of its proper divisors (30539557).

20125133123 is an equidigital number, since it uses as much as digits as its factorization.

20125133123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30539556.

The product of its (nonzero) digits is 1080, while the sum is 23.

Adding to 20125133123 its reverse (32133152102), we get a palindrome (52258285225).

The spelling of 20125133123 in words is "twenty billion, one hundred twenty-five million, one hundred thirty-three thousand, one hundred twenty-three".