21834413 has 2 divisors, whose sum is σ = 21834414. Its totient is φ = 21834412.

The previous prime is 21834391. The next prime is 21834431. The reversal of 21834413 is 31443812.

Together with next prime (21834431) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20097289 + 1737124 = 4483^2 + 1318^2 .

It is a cyclic number.

It is not a de Polignac number, because 21834413 - 2⁶ = 21834349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21834433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10917206 + 10917207.

It is an arithmetic number, because the mean of its divisors is an integer number (10917207).

Almost surely, 2^21834413 is an apocalyptic number.

It is an amenable number.

21834413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21834413 is an equidigital number, since it uses as much as digits as its factorization.

21834413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 26.

The square root of 21834413 is about 4672.7307861678. The cubic root of 21834413 is about 279.4991599464.

The spelling of 21834413 in words is "twenty-one million, eight hundred thirty-four thousand, four hundred thirteen".