21055703 has 2 divisors, whose sum is σ = 21055704. Its totient is φ = 21055702.

The previous prime is 21055691. The next prime is 21055717. The reversal of 21055703 is 30755012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21055703 - 2⁴ = 21055687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21055733) 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, 10527851 + 10527852.

It is an arithmetic number, because the mean of its divisors is an integer number (10527852).

Almost surely, 2^21055703 is an apocalyptic number.

21055703 is a deficient number, since it is larger than the sum of its proper divisors (1).

21055703 is an equidigital number, since it uses as much as digits as its factorization.

21055703 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 21055703 is about 4588.6493655541. The cubic root of 21055703 is about 276.1361393413.

The spelling of 21055703 in words is "twenty-one million, fifty-five thousand, seven hundred three".