21585134 has 8 divisors (see below), whose sum is σ = 33252888. Its totient is φ = 10500840.

The previous prime is 21585133. The next prime is 21585139. The reversal of 21585134 is 43158512.

21585134 = 306² + 307² + ... + 453².

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

It is a junction number, because it is equal to n+sod(n) for n = 21585097 and 21585106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21585133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145772 + ... + 145919.

It is an arithmetic number, because the mean of its divisors is an integer number (4156611).

Almost surely, 2^21585134 is an apocalyptic number.

21585134 is a deficient number, since it is larger than the sum of its proper divisors (11667754).

21585134 is a wasteful number, since it uses less digits than its factorization.

21585134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291730.

The product of its digits is 4800, while the sum is 29.

The square root of 21585134 is about 4645.9804132174. The cubic root of 21585134 is about 278.4314247430.

The spelling of 21585134 in words is "twenty-one million, five hundred eighty-five thousand, one hundred thirty-four".