20110111020221 has 4 divisors (see below), whose sum is σ = 20110598213244. Its totient is φ = 20109623827200.

The previous prime is 20110111020193. The next prime is 20110111020269. The reversal of 20110111020221 is 12202011101102.

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 14261113879321 + 5848997140900 = 3776389^2 + 2418470^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110111020221 - 2⁶ = 20110111020157 is a prime.

It is a super-2 number, since 2×20110111020221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20110111020196 and 20110111020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20110111020271) 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, 243534590 + ... + 243617151.

It is an arithmetic number, because the mean of its divisors is an integer number (5027649553311).

Almost surely, 2^{20110111020221} is an apocalyptic number.

It is an amenable number.

20110111020221 is a deficient number, since it is larger than the sum of its proper divisors (487193023).

20110111020221 is an equidigital number, since it uses as much as digits as its factorization.

20110111020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487193022.

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

Adding to 20110111020221 its reverse (12202011101102), we get a palindrome (32312122121323).

The spelling of 20110111020221 in words is "twenty trillion, one hundred ten billion, one hundred eleven million, twenty thousand, two hundred twenty-one".