21675834 has 24 divisors (see below), whose sum is σ = 47852532. Its totient is φ = 7088640.

The previous prime is 21675811. The next prime is 21675853. The reversal of 21675834 is 43857612.

It can be written as a sum of positive squares in 2 ways, for example, as 21594609 + 81225 = 4647^2 + 285^2 .

It is a super-3 number, since 3×21675834³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10407 + ... + 12314.

Almost surely, 2^21675834 is an apocalyptic number.

21675834 is an abundant number, since it is smaller than the sum of its proper divisors (26176698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21675834 is a wasteful number, since it uses less digits than its factorization.

21675834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22782 (or 22779 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 21675834 is about 4655.7313066800. The cubic root of 21675834 is about 278.8208662416.

It can be divided in two parts, 2167 and 5834, that added together give a triangular number (8001 = T₁₂₆).

The spelling of 21675834 in words is "twenty-one million, six hundred seventy-five thousand, eight hundred thirty-four".