21652193 has 2 divisors, whose sum is σ = 21652194. Its totient is φ = 21652192.

The previous prime is 21652181. The next prime is 21652201. The reversal of 21652193 is 39125612.

21652193 is nontrivially palindromic in base 13.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18386944 + 3265249 = 4288^2 + 1807^2 .

It is a cyclic number.

It is not a de Polignac number, because 21652193 - 2¹⁶ = 21586657 is a prime.

It is not a weakly prime, because it can be changed into another prime (21652493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826096 + 10826097.

It is an arithmetic number, because the mean of its divisors is an integer number (10826097).

Almost surely, 2^21652193 is an apocalyptic number.

It is an amenable number.

21652193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21652193 is an equidigital number, since it uses as much as digits as its factorization.

21652193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 21652193 is about 4653.1917003279. The cubic root of 21652193 is about 278.7194629622.

The spelling of 21652193 in words is "twenty-one million, six hundred fifty-two thousand, one hundred ninety-three".