21083471 has 8 divisors (see below), whose sum is σ = 21700224. Its totient is φ = 20471680.

The previous prime is 21083449. The next prime is 21083537. The reversal of 21083471 is 17438012.

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 21083471 - 2¹⁰ = 21082447 is a prime.

It is a super-3 number, since 3×21083471³ (a number of 23 digits) contains 333 as substring.

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 21083471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21083431) 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 7 ways as a sum of consecutive naturals, for example, 8450 + ... + 10656.

It is an arithmetic number, because the mean of its divisors is an integer number (2712528).

Almost surely, 2^21083471 is an apocalyptic number.

21083471 is a deficient number, since it is larger than the sum of its proper divisors (616753).

21083471 is a wasteful number, since it uses less digits than its factorization.

21083471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 21083471 is about 4591.6740955778. The cubic root of 21083471 is about 276.2574743240.

The spelling of 21083471 in words is "twenty-one million, eighty-three thousand, four hundred seventy-one".