21114173 has 2 divisors, whose sum is σ = 21114174. Its totient is φ = 21114172.

The previous prime is 21114169. The next prime is 21114209. The reversal of 21114173 is 37141112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15856324 + 5257849 = 3982^2 + 2293^2 .

It is a cyclic number.

It is not a de Polignac number, because 21114173 - 2² = 21114169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21114103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10557086 + 10557087.

It is an arithmetic number, because the mean of its divisors is an integer number (10557087).

Almost surely, 2^21114173 is an apocalyptic number.

It is an amenable number.

21114173 is a deficient number, since it is larger than the sum of its proper divisors (1).

21114173 is an equidigital number, since it uses as much as digits as its factorization.

21114173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 20.

The square root of 21114173 is about 4595.0161044331. The cubic root of 21114173 is about 276.3915057535.

Adding to 21114173 its reverse (37141112), we get a palindrome (58255285).

The spelling of 21114173 in words is "twenty-one million, one hundred fourteen thousand, one hundred seventy-three".