21051341 has 2 divisors, whose sum is σ = 21051342. Its totient is φ = 21051340.

The previous prime is 21051337. The next prime is 21051343. The reversal of 21051341 is 14315012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20967241 + 84100 = 4579^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 21051341 - 2² = 21051337 is a prime.

Together with 21051343, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21051343) 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, 10525670 + 10525671.

It is an arithmetic number, because the mean of its divisors is an integer number (10525671).

Almost surely, 2^21051341 is an apocalyptic number.

It is an amenable number.

21051341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21051341 is an equidigital number, since it uses as much as digits as its factorization.

21051341 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21051341 is about 4588.1740376756. The cubic root of 21051341 is about 276.1170694639.

Adding to 21051341 its reverse (14315012), we get a palindrome (35366353).

The spelling of 21051341 in words is "twenty-one million, fifty-one thousand, three hundred forty-one".