21859485 has 16 divisors (see below), whose sum is σ = 35456064. Its totient is φ = 11498112.

The previous prime is 21859483. The next prime is 21859507. The reversal of 21859485 is 58495812.

It is a happy number.

It is not a de Polignac number, because 21859485 - 2¹ = 21859483 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21859483) 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 15 ways as a sum of consecutive naturals, for example, 8887 + ... + 11076.

It is an arithmetic number, because the mean of its divisors is an integer number (2216004).

Almost surely, 2^21859485 is an apocalyptic number.

It is an amenable number.

21859485 is a deficient number, since it is larger than the sum of its proper divisors (13596579).

21859485 is a wasteful number, since it uses less digits than its factorization.

21859485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20044.

The product of its digits is 115200, while the sum is 42.

The square root of 21859485 is about 4675.4128159982. The cubic root of 21859485 is about 279.6061000386.

The spelling of 21859485 in words is "twenty-one million, eight hundred fifty-nine thousand, four hundred eighty-five".