21148783 has 2 divisors, whose sum is σ = 21148784. Its totient is φ = 21148782.

The previous prime is 21148769. The next prime is 21148807. The reversal of 21148783 is 38784112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21148783 - 2⁹ = 21148271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21148703) 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, 10574391 + 10574392.

It is an arithmetic number, because the mean of its divisors is an integer number (10574392).

Almost surely, 2^21148783 is an apocalyptic number.

21148783 is a deficient number, since it is larger than the sum of its proper divisors (1).

21148783 is an equidigital number, since it uses as much as digits as its factorization.

21148783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 34.

The square root of 21148783 is about 4598.7805992458. The cubic root of 21148783 is about 276.5424420939.

The spelling of 21148783 in words is "twenty-one million, one hundred forty-eight thousand, seven hundred eighty-three".