20021120111 has 4 divisors (see below), whose sum is σ = 20021617992. Its totient is φ = 20020622232.

The previous prime is 20021120083. The next prime is 20021120117. The reversal of 20021120111 is 11102112002.

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 20021120111 - 2¹⁴ = 20021103727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021120092 and 20021120101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021120117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182756 + ... + 271001.

It is an arithmetic number, because the mean of its divisors is an integer number (5005404498).

Almost surely, 2^20021120111 is an apocalyptic number.

20021120111 is a deficient number, since it is larger than the sum of its proper divisors (497881).

20021120111 is an equidigital number, since it uses as much as digits as its factorization.

20021120111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497880.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20021120111 its reverse (11102112002), we get a palindrome (31123232113).

The spelling of 20021120111 in words is "twenty billion, twenty-one million, one hundred twenty thousand, one hundred eleven".