20110001123 has 4 divisors (see below), whose sum is σ = 20113717560. Its totient is φ = 20106284688.

The previous prime is 20110001111. The next prime is 20110001159. The reversal of 20110001123 is 32110001102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20110001123 is a prime.

It is a super-2 number, since 2×20110001123² (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 (20110001173) 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, 1850090 + ... + 1860927.

It is an arithmetic number, because the mean of its divisors is an integer number (5028429390).

Almost surely, 2^20110001123 is an apocalyptic number.

20110001123 is a deficient number, since it is larger than the sum of its proper divisors (3716437).

20110001123 is an equidigital number, since it uses as much as digits as its factorization.

20110001123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3716436.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 20110001123 its reverse (32110001102), we get a palindrome (52220002225).

The spelling of 20110001123 in words is "twenty billion, one hundred ten million, one thousand, one hundred twenty-three".