20012100123 has 16 divisors (see below), whose sum is σ = 27342000000. Its totient is φ = 13012000320.

The previous prime is 20012100079. The next prime is 20012100133. The reversal of 20012100123 is 32100121002.

It is not a de Polignac number, because 20012100123 - 2¹⁰ = 20012099099 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20012100099 and 20012100108.

It is not an unprimeable number, because it can be changed into a prime (20012100133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407128 + ... + 453626.

It is an arithmetic number, because the mean of its divisors is an integer number (1708875000).

Almost surely, 2^20012100123 is an apocalyptic number.

20012100123 is a deficient number, since it is larger than the sum of its proper divisors (7329899877).

20012100123 is a wasteful number, since it uses less digits than its factorization.

20012100123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50042.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20012100123 its reverse (32100121002), we get a palindrome (52112221125).

The spelling of 20012100123 in words is "twenty billion, twelve million, one hundred thousand, one hundred twenty-three".