21695353 has 2 divisors, whose sum is σ = 21695354. Its totient is φ = 21695352.

The previous prime is 21695351. The next prime is 21695389. The reversal of 21695353 is 35359612.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21650409 + 44944 = 4653^2 + 212^2 .

It is a cyclic number.

It is not a de Polignac number, because 21695353 - 2¹ = 21695351 is a prime.

Together with 21695351, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21695351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10847676 + 10847677.

It is an arithmetic number, because the mean of its divisors is an integer number (10847677).

Almost surely, 2^21695353 is an apocalyptic number.

It is an amenable number.

21695353 is a deficient number, since it is larger than the sum of its proper divisors (1).

21695353 is an equidigital number, since it uses as much as digits as its factorization.

21695353 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 21695353 is about 4657.8270684945. The cubic root of 21695353 is about 278.9045334831.

The spelling of 21695353 in words is "twenty-one million, six hundred ninety-five thousand, three hundred fifty-three".