110691221 has 2 divisors, whose sum is σ = 110691222. Its totient is φ = 110691220.

The previous prime is 110691209. The next prime is 110691223. The reversal of 110691221 is 122196011.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100200100 + 10491121 = 10010^2 + 3239^2 .

It is a cyclic number.

It is not a de Polignac number, because 110691221 - 2¹⁰ = 110690197 is a prime.

It is a Sophie Germain prime.

Together with 110691223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (110691223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55345610 + 55345611.

It is an arithmetic number, because the mean of its divisors is an integer number (55345611).

Almost surely, 2^110691221 is an apocalyptic number.

It is an amenable number.

110691221 is a deficient number, since it is larger than the sum of its proper divisors (1).

110691221 is an equidigital number, since it uses as much as digits as its factorization.

110691221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 110691221 is about 10520.9895447149. The cubic root of 110691221 is about 480.1435059921.

The spelling of 110691221 in words is "one hundred ten million, six hundred ninety-one thousand, two hundred twenty-one".