20011011202123 has 4 divisors (see below), whose sum is σ = 20011113053568. Its totient is φ = 20010909350680.

The previous prime is 20011011202111. The next prime is 20011011202139. The reversal of 20011011202123 is 32120211011002.

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-20011011202123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011011202097 and 20011011202106.

It is not an unprimeable number, because it can be changed into a prime (20011011202103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50630443 + ... + 51024148.

It is an arithmetic number, because the mean of its divisors is an integer number (5002778263392).

Almost surely, 2^{20011011202123} is an apocalyptic number.

20011011202123 is a deficient number, since it is larger than the sum of its proper divisors (101851445).

20011011202123 is a wasteful number, since it uses less digits than its factorization.

20011011202123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101851444.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20011011202123 its reverse (32120211011002), we get a palindrome (52131222213125).

The spelling of 20011011202123 in words is "twenty trillion, eleven billion, eleven million, two hundred two thousand, one hundred twenty-three".