21460471 has 4 divisors (see below), whose sum is σ = 21812344. Its totient is φ = 21108600.

The previous prime is 21460469. The next prime is 21460499. The reversal of 21460471 is 17406412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21460471 - 2¹ = 21460469 is a prime.

It is a super-3 number, since 3×21460471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21460441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175845 + ... + 175966.

It is an arithmetic number, because the mean of its divisors is an integer number (5453086).

Almost surely, 2^21460471 is an apocalyptic number.

21460471 is a deficient number, since it is larger than the sum of its proper divisors (351873).

21460471 is an equidigital number, since it uses as much as digits as its factorization.

21460471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351872.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21460471 is about 4632.5447650293. The cubic root of 21460471 is about 277.8943709600.

Adding to 21460471 its reverse (17406412), we get a palindrome (38866883).

The spelling of 21460471 in words is "twenty-one million, four hundred sixty thousand, four hundred seventy-one".