21365353 has 2 divisors, whose sum is σ = 21365354. Its totient is φ = 21365352.

The previous prime is 21365347. The next prime is 21365359. The reversal of 21365353 is 35356312.

It is a balanced prime because it is at equal distance from previous prime (21365347) and next prime (21365359).

It can be written as a sum of positive squares in only one way, i.e., 19820304 + 1545049 = 4452^2 + 1243^2 .

It is a cyclic number.

It is not a de Polignac number, because 21365353 - 2⁹ = 21364841 is a prime.

It is not a weakly prime, because it can be changed into another prime (21365359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10682676 + 10682677.

It is an arithmetic number, because the mean of its divisors is an integer number (10682677).

Almost surely, 2^21365353 is an apocalyptic number.

It is an amenable number.

21365353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21365353 is an equidigital number, since it uses as much as digits as its factorization.

21365353 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 28.

The square root of 21365353 is about 4622.2670844511. The cubic root of 21365353 is about 277.4831978572.

The spelling of 21365353 in words is "twenty-one million, three hundred sixty-five thousand, three hundred fifty-three".