21334723 has 2 divisors, whose sum is σ = 21334724. Its totient is φ = 21334722.

The previous prime is 21334721. The next prime is 21334759. The reversal of 21334723 is 32743312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21334723 - 2¹ = 21334721 is a prime.

Together with 21334721, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21334721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10667361 + 10667362.

It is an arithmetic number, because the mean of its divisors is an integer number (10667362).

Almost surely, 2^21334723 is an apocalyptic number.

21334723 is a deficient number, since it is larger than the sum of its proper divisors (1).

21334723 is an equidigital number, since it uses as much as digits as its factorization.

21334723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 25.

The square root of 21334723 is about 4618.9525868967. The cubic root of 21334723 is about 277.3505317411.

The spelling of 21334723 in words is "twenty-one million, three hundred thirty-four thousand, seven hundred twenty-three".