21084185 has 8 divisors (see below), whose sum is σ = 26117376. Its totient is φ = 16323120.

The previous prime is 21084139. The next prime is 21084187. The reversal of 21084185 is 58148012.

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

It is not a de Polignac number, because 21084185 - 2⁸ = 21083929 is a prime.

It is a super-2 number, since 2×21084185² = 889085714228450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21084187) 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, 67859 + ... + 68168.

It is an arithmetic number, because the mean of its divisors is an integer number (3264672).

Almost surely, 2^21084185 is an apocalyptic number.

It is an amenable number.

21084185 is a deficient number, since it is larger than the sum of its proper divisors (5033191).

21084185 is a wasteful number, since it uses less digits than its factorization.

21084185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136063.

The product of its (nonzero) digits is 2560, while the sum is 29.

The square root of 21084185 is about 4591.7518443400. The cubic root of 21084185 is about 276.2605928113.

The spelling of 21084185 in words is "twenty-one million, eighty-four thousand, one hundred eighty-five".