110020021 has 4 divisors (see below), whose sum is σ = 110184172. Its totient is φ = 109855872.

The previous prime is 110020003. The next prime is 110020049. The reversal of 110020021 is 120020011.

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 36300625 + 73719396 = 6025^2 + 8586^2 .

It is a cyclic number.

It is not a de Polignac number, because 110020021 - 2⁷ = 110019893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 110019986 and 110020013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (110020081) 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, 81066 + ... + 82411.

It is an arithmetic number, because the mean of its divisors is an integer number (27546043).

Almost surely, 2^110020021 is an apocalyptic number.

It is an amenable number.

110020021 is a deficient number, since it is larger than the sum of its proper divisors (164151).

110020021 is an equidigital number, since it uses as much as digits as its factorization.

110020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164150.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 110020021 is about 10489.0429020002. The cubic root of 110020021 is about 479.1710533419.

Adding to 110020021 its reverse (120020011), we get a palindrome (230040032).

The spelling of 110020021 in words is "one hundred ten million, twenty thousand, twenty-one".