20111123201 has 24 divisors (see below), whose sum is σ = 21952270080. Its totient is φ = 18415488000.

The previous prime is 20111123189. The next prime is 20111123231. The reversal of 20111123201 is 10232111102.

It is not a de Polignac number, because 20111123201 - 2¹⁰ = 20111122177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20111123231) 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 23 ways as a sum of consecutive naturals, for example, 12560801 + ... + 12562401.

It is an arithmetic number, because the mean of its divisors is an integer number (914677920).

Almost surely, 2^20111123201 is an apocalyptic number.

It is an amenable number.

20111123201 is a deficient number, since it is larger than the sum of its proper divisors (1841146879).

20111123201 is a wasteful number, since it uses less digits than its factorization.

20111123201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177 (or 2164 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20111123201 its reverse (10232111102), we get a palindrome (30343234303).

The spelling of 20111123201 in words is "twenty billion, one hundred eleven million, one hundred twenty-three thousand, two hundred one".