21873585 has 8 divisors (see below), whose sum is σ = 34997760. Its totient is φ = 11665904.

The previous prime is 21873539. The next prime is 21873589. The reversal of 21873585 is 58537812.

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 21873585 - 2⁶ = 21873521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21873589) 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, 729105 + ... + 729134.

It is an arithmetic number, because the mean of its divisors is an integer number (4374720).

Almost surely, 2^21873585 is an apocalyptic number.

It is an amenable number.

21873585 is a deficient number, since it is larger than the sum of its proper divisors (13124175).

21873585 is a wasteful number, since it uses less digits than its factorization.

21873585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458247.

The product of its digits is 67200, while the sum is 39.

The square root of 21873585 is about 4676.9204611582. The cubic root of 21873585 is about 279.6662051242. Note that the first 3 decimals are identical.

The spelling of 21873585 in words is "twenty-one million, eight hundred seventy-three thousand, five hundred eighty-five".