21078703 has 2 divisors, whose sum is σ = 21078704. Its totient is φ = 21078702.

The previous prime is 21078637. The next prime is 21078719. The reversal of 21078703 is 30787012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21078703 - 2⁹ = 21078191 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21078103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10539351 + 10539352.

It is an arithmetic number, because the mean of its divisors is an integer number (10539352).

Almost surely, 2^21078703 is an apocalyptic number.

21078703 is a deficient number, since it is larger than the sum of its proper divisors (1).

21078703 is an equidigital number, since it uses as much as digits as its factorization.

21078703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 21078703 is about 4591.1548656084. The cubic root of 21078703 is about 276.2366476624.

The spelling of 21078703 in words is "twenty-one million, seventy-eight thousand, seven hundred three".