21049185 has 32 divisors (see below), whose sum is σ = 34951680. Its totient is φ = 10810368.

The previous prime is 21049177. The next prime is 21049199. The reversal of 21049185 is 58194012.

It is a happy number.

It is not a de Polignac number, because 21049185 - 2³ = 21049177 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51261 + ... + 51669.

It is an arithmetic number, because the mean of its divisors is an integer number (1092240).

Almost surely, 2^21049185 is an apocalyptic number.

It is an amenable number.

21049185 is a deficient number, since it is larger than the sum of its proper divisors (13902495).

21049185 is a wasteful number, since it uses less digits than its factorization.

21049185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 21049185 is about 4587.9390798048. The cubic root of 21049185 is about 276.1076428478.

The spelling of 21049185 in words is "twenty-one million, forty-nine thousand, one hundred eighty-five".