20101113123 has 64 divisors (see below), whose sum is σ = 35013565440. Its totient is φ = 9954312192.

The previous prime is 20101113113. The next prime is 20101113139. The reversal of 20101113123 is 32131110102.

It is a happy number.

It is not a de Polignac number, because 20101113123 - 2¹⁰ = 20101112099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20101113113) 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 63 ways as a sum of consecutive naturals, for example, 1939411 + ... + 1949747.

It is an arithmetic number, because the mean of its divisors is an integer number (547086960).

Almost surely, 2^20101113123 is an apocalyptic number.

20101113123 is a deficient number, since it is larger than the sum of its proper divisors (14912452317).

20101113123 is a wasteful number, since it uses less digits than its factorization.

20101113123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10796.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 20101113123 its reverse (32131110102), we get a palindrome (52232223225).

The spelling of 20101113123 in words is "twenty billion, one hundred one million, one hundred thirteen thousand, one hundred twenty-three".