20011031102123 has 4 divisors (see below), whose sum is σ = 20011397786688. Its totient is φ = 20010664417560.

The previous prime is 20011031102107. The next prime is 20011031102131. The reversal of 20011031102123 is 32120113011002.

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

It is a cyclic number.

It is not a de Polignac number, because 20011031102123 - 2⁴ = 20011031102107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20011051102123) 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, 183260411 + ... + 183369572.

It is an arithmetic number, because the mean of its divisors is an integer number (5002849446672).

Almost surely, 2^{20011031102123} is an apocalyptic number.

20011031102123 is a deficient number, since it is larger than the sum of its proper divisors (366684565).

20011031102123 is an equidigital number, since it uses as much as digits as its factorization.

20011031102123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366684564.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 20011031102123 its reverse (32120113011002), we get a palindrome (52131144113125).

The spelling of 20011031102123 in words is "twenty trillion, eleven billion, thirty-one million, one hundred two thousand, one hundred twenty-three".