20100220111 has 4 divisors (see below), whose sum is σ = 20590469424. Its totient is φ = 19609970800.

The previous prime is 20100220109. The next prime is 20100220139. The reversal of 20100220111 is 11102200102.

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 20100220111 - 2¹ = 20100220109 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 (20100220411) 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, 245124595 + ... + 245124676.

It is an arithmetic number, because the mean of its divisors is an integer number (5147617356).

Almost surely, 2^20100220111 is an apocalyptic number.

20100220111 is a deficient number, since it is larger than the sum of its proper divisors (490249313).

20100220111 is an equidigital number, since it uses as much as digits as its factorization.

20100220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490249312.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20100220111 its reverse (11102200102), we get a palindrome (31202420213).

The spelling of 20100220111 in words is "twenty billion, one hundred million, two hundred twenty thousand, one hundred eleven".