21343141 has 2 divisors, whose sum is σ = 21343142. Its totient is φ = 21343140.

The previous prime is 21343139. The next prime is 21343151. The reversal of 21343141 is 14134312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14861025 + 6482116 = 3855^2 + 2546^2 .

It is a cyclic number.

It is not a de Polignac number, because 21343141 - 2¹ = 21343139 is a prime.

Together with 21343139, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21343111) 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, 10671570 + 10671571.

It is an arithmetic number, because the mean of its divisors is an integer number (10671571).

Almost surely, 2^21343141 is an apocalyptic number.

It is an amenable number.

21343141 is a deficient number, since it is larger than the sum of its proper divisors (1).

21343141 is an equidigital number, since it uses as much as digits as its factorization.

21343141 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 288, while the sum is 19.

The square root of 21343141 is about 4619.8637425794. The cubic root of 21343141 is about 277.3870048304.

Adding to 21343141 its reverse (14134312), we get a palindrome (35477453).

The spelling of 21343141 in words is "twenty-one million, three hundred forty-three thousand, one hundred forty-one".