21230193 has 16 divisors (see below), whose sum is σ = 29252096. Its totient is φ = 13685760.

The previous prime is 21230179. The next prime is 21230203. The reversal of 21230193 is 39103212.

It is a happy number.

It is not a de Polignac number, because 21230193 - 2⁴ = 21230177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21230123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20928 + ... + 21918.

It is an arithmetic number, because the mean of its divisors is an integer number (1828256).

Almost surely, 2^21230193 is an apocalyptic number.

It is an amenable number.

21230193 is a deficient number, since it is larger than the sum of its proper divisors (8021903).

21230193 is a wasteful number, since it uses less digits than its factorization.

21230193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224.

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21230193 is about 4607.6233570030. The cubic root of 21230193 is about 276.8968280379.

The spelling of 21230193 in words is "twenty-one million, two hundred thirty thousand, one hundred ninety-three".