20101123203 has 16 divisors (see below), whose sum is σ = 30634496256. Its totient is φ = 11484776160.

The previous prime is 20101123157. The next prime is 20101123219. The reversal of 20101123203 is 30232110102.

It is not a de Polignac number, because 20101123203 - 2¹³ = 20101115011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20101123243) 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 15 ways as a sum of consecutive naturals, for example, 100213 + ... + 224153.

It is an arithmetic number, because the mean of its divisors is an integer number (1914656016).

Almost surely, 2^20101123203 is an apocalyptic number.

20101123203 is a deficient number, since it is larger than the sum of its proper divisors (10533373053).

20101123203 is a wasteful number, since it uses less digits than its factorization.

20101123203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131674.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 20101123203 its reverse (30232110102), we get a palindrome (50333233305).

The spelling of 20101123203 in words is "twenty billion, one hundred one million, one hundred twenty-three thousand, two hundred three".