21049703 has 2 divisors, whose sum is σ = 21049704. Its totient is φ = 21049702.

The previous prime is 21049681. The next prime is 21049709. The reversal of 21049703 is 30794012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21049703 - 2¹⁴ = 21033319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21049709) 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, 10524851 + 10524852.

It is an arithmetic number, because the mean of its divisors is an integer number (10524852).

Almost surely, 2^21049703 is an apocalyptic number.

21049703 is a deficient number, since it is larger than the sum of its proper divisors (1).

21049703 is an equidigital number, since it uses as much as digits as its factorization.

21049703 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21049703 is about 4587.9955318200. The cubic root of 21049703 is about 276.1099077429.

The spelling of 21049703 in words is "twenty-one million, forty-nine thousand, seven hundred three".