110921 has 2 divisors, whose sum is σ = 110922. Its totient is φ = 110920.

The previous prime is 110917. The next prime is 110923. The reversal of 110921 is 129011.

110921 = 235² + 236².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55696 + 55225 = 236^2 + 235^2 .

It is an emirp because it is prime and its reverse (129011) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 110921 - 2² = 110917 is a prime.

Together with 110923, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 110896 and 110905.

It is not a weakly prime, because it can be changed into another prime (110923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55460 + 55461.

It is an arithmetic number, because the mean of its divisors is an integer number (55461).

2¹¹⁰⁹²¹ is an apocalyptic number.

110921 is the 236-th centered square number.

It is an amenable number.

110921 is a deficient number, since it is larger than the sum of its proper divisors (1).

110921 is an equidigital number, since it uses as much as digits as its factorization.

110921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 110921 is about 333.0480445822. The cubic root of 110921 is about 48.0475512574.

Adding to 110921 its reverse (129011), we get a palindrome (239932).

The spelling of 110921 in words is "one hundred ten thousand, nine hundred twenty-one".