21342341 has 2 divisors, whose sum is σ = 21342342. Its totient is φ = 21342340.

The previous prime is 21342337. The next prime is 21342359. The reversal of 21342341 is 14324312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19228225 + 2114116 = 4385^2 + 1454^2 .

It is a cyclic number.

It is not a de Polignac number, because 21342341 - 2² = 21342337 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21342311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10671170 + 10671171.

It is an arithmetic number, because the mean of its divisors is an integer number (10671171).

Almost surely, 2^21342341 is an apocalyptic number.

It is an amenable number.

21342341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21342341 is an equidigital number, since it uses as much as digits as its factorization.

21342341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 20.

The square root of 21342341 is about 4619.7771591279. Note that the first 3 decimals coincide. The cubic root of 21342341 is about 277.3835390428.

Adding to 21342341 its reverse (14324312), we get a palindrome (35666653).

The spelling of 21342341 in words is "twenty-one million, three hundred forty-two thousand, three hundred forty-one".