21180703 has 2 divisors, whose sum is σ = 21180704. Its totient is φ = 21180702.

The previous prime is 21180697. The next prime is 21180707. The reversal of 21180703 is 30708112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21180703 - 2⁹ = 21180191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21180707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10590351 + 10590352.

It is an arithmetic number, because the mean of its divisors is an integer number (10590352).

Almost surely, 2^21180703 is an apocalyptic number.

21180703 is a deficient number, since it is larger than the sum of its proper divisors (1).

21180703 is an equidigital number, since it uses as much as digits as its factorization.

21180703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 21180703 is about 4602.2497759248. The cubic root of 21180703 is about 276.6815012771.

Adding to 21180703 its reverse (30708112), we get a palindrome (51888815).

The spelling of 21180703 in words is "twenty-one million, one hundred eighty thousand, seven hundred three".