110021 has 4 divisors (see below), whose sum is σ = 110700. Its totient is φ = 109344.

The previous prime is 110017. The next prime is 110023. The reversal of 110021 is 120011.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 52900 + 57121 = 230^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 110021 - 2² = 110017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 109987 and 110014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (110023) 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, 65 + ... + 473.

It is an arithmetic number, because the mean of its divisors is an integer number (27675).

2¹¹⁰⁰²¹ is an apocalyptic number.

It is an amenable number.

110021 is a deficient number, since it is larger than the sum of its proper divisors (679).

110021 is an equidigital number, since it uses as much as digits as its factorization.

110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678.

The product of its (nonzero) digits is 2, while the sum is 5.

The square root of 110021 is about 331.6941362159. The cubic root of 110021 is about 47.9172474620.

Adding to 110021 its reverse (120011), we get a palindrome (230032).

Multiplying 110021 by its reverse (120011), we get a palindrome (13203730231).

The spelling of 110021 in words is "one hundred ten thousand, twenty-one", and thus it is an iban number.