21486085 has 8 divisors (see below), whose sum is σ = 26480376. Its totient is φ = 16724160.

The previous prime is 21486083. The next prime is 21486119. The reversal of 21486085 is 58068412.

It can be written as a sum of positive squares in 4 ways, for example, as 3090564 + 18395521 = 1758^2 + 4289^2 .

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

It is not a de Polignac number, because 21486085 - 2¹ = 21486083 is a prime.

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 21486085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21486083) 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, 57886 + ... + 58255.

It is an arithmetic number, because the mean of its divisors is an integer number (3310047).

Almost surely, 2^21486085 is an apocalyptic number.

It is an amenable number.

21486085 is a deficient number, since it is larger than the sum of its proper divisors (4994291).

21486085 is a wasteful number, since it uses less digits than its factorization.

21486085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116183.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 21486085 is about 4635.3085118469. The cubic root of 21486085 is about 278.0048866522.

The spelling of 21486085 in words is "twenty-one million, four hundred eighty-six thousand, eighty-five".