21194353 has 2 divisors, whose sum is σ = 21194354. Its totient is φ = 21194352.

The previous prime is 21194351. The next prime is 21194387. The reversal of 21194353 is 35349112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16834609 + 4359744 = 4103^2 + 2088^2 .

It is a cyclic number.

It is not a de Polignac number, because 21194353 - 2¹ = 21194351 is a prime.

Together with 21194351, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21194351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10597176 + 10597177.

It is an arithmetic number, because the mean of its divisors is an integer number (10597177).

Almost surely, 2^21194353 is an apocalyptic number.

It is an amenable number.

21194353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21194353 is an equidigital number, since it uses as much as digits as its factorization.

21194353 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 28.

The square root of 21194353 is about 4603.7325074335. The cubic root of 21194353 is about 276.7409247293.

The spelling of 21194353 in words is "twenty-one million, one hundred ninety-four thousand, three hundred fifty-three".