20112021103 has 4 divisors (see below), whose sum is σ = 20579742568. Its totient is φ = 19644299640.

The previous prime is 20112021089. The next prime is 20112021119. The reversal of 20112021103 is 30112021102.

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-20112021103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20112021203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 233860668 + ... + 233860753.

It is an arithmetic number, because the mean of its divisors is an integer number (5144935642).

Almost surely, 2^20112021103 is an apocalyptic number.

20112021103 is a deficient number, since it is larger than the sum of its proper divisors (467721465).

20112021103 is an equidigital number, since it uses as much as digits as its factorization.

20112021103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467721464.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20112021103 its reverse (30112021102), we get a palindrome (50224042205).

Subtracting 20112021103 from its reverse (30112021102), we obtain a palindrome (9999999999).

The spelling of 20112021103 in words is "twenty billion, one hundred twelve million, twenty-one thousand, one hundred three".