21703471 has 2 divisors, whose sum is σ = 21703472. Its totient is φ = 21703470.

The previous prime is 21703469. The next prime is 21703483. The reversal of 21703471 is 17430712.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21703471 - 2¹ = 21703469 is a prime.

It is a super-3 number, since 3×21703471³ (a number of 23 digits) contains 333 as substring.

Together with 21703469, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21703771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10851735 + 10851736.

It is an arithmetic number, because the mean of its divisors is an integer number (10851736).

Almost surely, 2^21703471 is an apocalyptic number.

21703471 is a deficient number, since it is larger than the sum of its proper divisors (1).

21703471 is an equidigital number, since it uses as much as digits as its factorization.

21703471 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 21703471 is about 4658.6984233796. The cubic root of 21703471 is about 278.9393161185.

The spelling of 21703471 in words is "twenty-one million, seven hundred three thousand, four hundred seventy-one".