20011120110021 has 16 divisors (see below), whose sum is σ = 26836990893440. Its totient is φ = 13263042461760.

The previous prime is 20011120109989. The next prime is 20011120110029. The reversal of 20011120110021 is 12001102111002.

It is not a de Polignac number, because 20011120110021 - 2⁵ = 20011120109989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011120109979 and 20011120110006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011120110029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3749590 + ... + 7354023.

It is an arithmetic number, because the mean of its divisors is an integer number (1677311930840).

Almost surely, 2^{20011120110021} is an apocalyptic number.

It is an amenable number.

20011120110021 is a deficient number, since it is larger than the sum of its proper divisors (6825870783419).

20011120110021 is a wasteful number, since it uses less digits than its factorization.

20011120110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11107116.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20011120110021 its reverse (12001102111002), we get a palindrome (32012222221023).

The spelling of 20011120110021 in words is "twenty trillion, eleven billion, one hundred twenty million, one hundred ten thousand, twenty-one".