21734593 has 2 divisors, whose sum is σ = 21734594. Its totient is φ = 21734592.

The previous prime is 21734527. The next prime is 21734621. The reversal of 21734593 is 39543712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18378369 + 3356224 = 4287^2 + 1832^2 .

It is a cyclic number.

It is not a de Polignac number, because 21734593 - 2¹³ = 21726401 is a prime.

It is not a weakly prime, because it can be changed into another prime (21734893) 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, 10867296 + 10867297.

It is an arithmetic number, because the mean of its divisors is an integer number (10867297).

Almost surely, 2^21734593 is an apocalyptic number.

It is an amenable number.

21734593 is a deficient number, since it is larger than the sum of its proper divisors (1).

21734593 is an equidigital number, since it uses as much as digits as its factorization.

21734593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 34.

The square root of 21734593 is about 4662.0374301372. The cubic root of 21734593 is about 279.0725821018.

The spelling of 21734593 in words is "twenty-one million, seven hundred thirty-four thousand, five hundred ninety-three".