21340411 has 2 divisors, whose sum is σ = 21340412. Its totient is φ = 21340410.

The previous prime is 21340409. The next prime is 21340421. The reversal of 21340411 is 11404312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21340411 - 2¹ = 21340409 is a prime.

Together with 21340409, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21340421) 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, 10670205 + 10670206.

It is an arithmetic number, because the mean of its divisors is an integer number (10670206).

Almost surely, 2^21340411 is an apocalyptic number.

21340411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21340411 is an equidigital number, since it uses as much as digits as its factorization.

21340411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21340411 is about 4619.5682698711. The cubic root of 21340411 is about 277.3751774739.

Adding to 21340411 its reverse (11404312), we get a palindrome (32744723).

The spelling of 21340411 in words is "twenty-one million, three hundred forty thousand, four hundred eleven".