21470471 has 16 divisors (see below), whose sum is σ = 24427008. Its totient is φ = 18698400.

The previous prime is 21470467. The next prime is 21470483. The reversal of 21470471 is 17407412.

It is a cyclic number.

It is not a de Polignac number, because 21470471 - 2² = 21470467 is a prime.

It is a super-3 number, since 3×21470471³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21470471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28526 + ... + 29268.

It is an arithmetic number, because the mean of its divisors is an integer number (1526688).

Almost surely, 2^21470471 is an apocalyptic number.

21470471 is a deficient number, since it is larger than the sum of its proper divisors (2956537).

21470471 is a wasteful number, since it uses less digits than its factorization.

21470471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 21470471 is about 4633.6239597102. The cubic root of 21470471 is about 277.9375280151.

Adding to 21470471 its reverse (17407412), we get a palindrome (38877883).

The spelling of 21470471 in words is "twenty-one million, four hundred seventy thousand, four hundred seventy-one".