21335141 has 2 divisors, whose sum is σ = 21335142. Its totient is φ = 21335140.

The previous prime is 21335137. The next prime is 21335143. The reversal of 21335141 is 14153312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20884900 + 450241 = 4570^2 + 671^2 .

It is a cyclic number.

It is not a de Polignac number, because 21335141 - 2² = 21335137 is a prime.

It is a Sophie Germain prime.

Together with 21335143, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21335143) 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, 10667570 + 10667571.

It is an arithmetic number, because the mean of its divisors is an integer number (10667571).

Almost surely, 2^21335141 is an apocalyptic number.

It is an amenable number.

21335141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21335141 is an equidigital number, since it uses as much as digits as its factorization.

21335141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 21335141 is about 4618.9978350287. The cubic root of 21335141 is about 277.3523430569.

Adding to 21335141 its sum of digits (20), we get a square (21335161 = 4619²).

Adding to 21335141 its reverse (14153312), we get a palindrome (35488453).

The spelling of 21335141 in words is "twenty-one million, three hundred thirty-five thousand, one hundred forty-one".