21596353 has 2 divisors, whose sum is σ = 21596354. Its totient is φ = 21596352.

The previous prime is 21596321. The next prime is 21596383. The reversal of 21596353 is 35369512.

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., 12159169 + 9437184 = 3487^2 + 3072^2 .

It is a cyclic number.

It is not a de Polignac number, because 21596353 - 2⁵ = 21596321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21596383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10798176 + 10798177.

It is an arithmetic number, because the mean of its divisors is an integer number (10798177).

Almost surely, 2^21596353 is an apocalyptic number.

It is an amenable number.

21596353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21596353 is an equidigital number, since it uses as much as digits as its factorization.

21596353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 34.

The square root of 21596353 is about 4647.1876441564. The cubic root of 21596353 is about 278.4796551767.

The spelling of 21596353 in words is "twenty-one million, five hundred ninety-six thousand, three hundred fifty-three".