20111120102021 has 4 divisors (see below), whose sum is σ = 21658129340652. Its totient is φ = 18564110863392.

The previous prime is 20111120101967. The next prime is 20111120102063. The reversal of 20111120102021 is 12020102111102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1052089209796 + 19059030892225 = 1025714^2 + 4365665^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111120102021 - 2¹⁰ = 20111120100997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111120101987 and 20111120102005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20111120107021) 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, 773504619296 + ... + 773504619321.

It is an arithmetic number, because the mean of its divisors is an integer number (5414532335163).

Almost surely, 2^{20111120102021} is an apocalyptic number.

It is an amenable number.

20111120102021 is a deficient number, since it is larger than the sum of its proper divisors (1547009238631).

20111120102021 is a wasteful number, since it uses less digits than its factorization.

20111120102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547009238630.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20111120102021 its reverse (12020102111102), we get a palindrome (32131222213123).

The spelling of 20111120102021 in words is "twenty trillion, one hundred eleven billion, one hundred twenty million, one hundred two thousand, twenty-one".