21348471 has 8 divisors (see below), whose sum is σ = 28746864. Its totient is φ = 14091200.

The previous prime is 21348461. The next prime is 21348479. The reversal of 21348471 is 17484312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21348471 - 2⁹ = 21347959 is a prime.

It is a super-3 number, since 3×21348471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34926 + ... + 35531.

It is an arithmetic number, because the mean of its divisors is an integer number (3593358).

Almost surely, 2^21348471 is an apocalyptic number.

21348471 is a deficient number, since it is larger than the sum of its proper divisors (7398393).

21348471 is a wasteful number, since it uses less digits than its factorization.

21348471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70561.

The product of its digits is 5376, while the sum is 30.

The square root of 21348471 is about 4620.4405634095. The cubic root of 21348471 is about 277.4100934295.

It can be divided in two parts, 213 and 48471, that added together give a palindrome (48684).

The spelling of 21348471 in words is "twenty-one million, three hundred forty-eight thousand, four hundred seventy-one".