20110101123 has 24 divisors (see below), whose sum is σ = 31320656400. Its totient is φ = 11443783680.

The previous prime is 20110101113. The next prime is 20110101173. The reversal of 20110101123 is 32110101102.

It is not a de Polignac number, because 20110101123 - 2¹⁸ = 20109838979 is a prime.

It is a super-2 number, since 2×20110101123² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20110101099 and 20110101108.

It is not an unprimeable number, because it can be changed into a prime (20110101103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 248398 + ... + 319251.

It is an arithmetic number, because the mean of its divisors is an integer number (1305027350).

Almost surely, 2^20110101123 is an apocalyptic number.

20110101123 is a deficient number, since it is larger than the sum of its proper divisors (11210555277).

20110101123 is a wasteful number, since it uses less digits than its factorization.

20110101123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567907 (or 567900 counting only the distinct ones).

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

Adding to 20110101123 its reverse (32110101102), we get a palindrome (52220202225).

The spelling of 20110101123 in words is "twenty billion, one hundred ten million, one hundred one thousand, one hundred twenty-three".