21422743 has 2 divisors, whose sum is σ = 21422744. Its totient is φ = 21422742.

The previous prime is 21422717. The next prime is 21422783. The reversal of 21422743 is 34722412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21422743 - 2⁵ = 21422711 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21422783) 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, 10711371 + 10711372.

It is an arithmetic number, because the mean of its divisors is an integer number (10711372).

Almost surely, 2^21422743 is an apocalyptic number.

21422743 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422743 is an equidigital number, since it uses as much as digits as its factorization.

21422743 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2688, while the sum is 25.

The square root of 21422743 is about 4628.4709138116. The cubic root of 21422743 is about 277.7314272115.

The spelling of 21422743 in words is "twenty-one million, four hundred twenty-two thousand, seven hundred forty-three".