21827634 has 8 divisors (see below), whose sum is σ = 43655280. Its totient is φ = 7275876.

The previous prime is 21827623. The next prime is 21827647. The reversal of 21827634 is 43672812.

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

21827634 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21827595 and 21827604.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1818964 + ... + 1818975.

It is an arithmetic number, because the mean of its divisors is an integer number (5456910).

Almost surely, 2^21827634 is an apocalyptic number.

21827634 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21827634 is a wasteful number, since it uses less digits than its factorization.

21827634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3637944.

The product of its digits is 16128, while the sum is 33.

The square root of 21827634 is about 4672.0053510243. The cubic root of 21827634 is about 279.4702312865.

The spelling of 21827634 in words is "twenty-one million, eight hundred twenty-seven thousand, six hundred thirty-four".