21833681 has 8 divisors (see below), whose sum is σ = 22133760. Its totient is φ = 21535632.

The previous prime is 21833677. The next prime is 21833699. The reversal of 21833681 is 18633812.

It is a happy number.

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 21833681 - 2² = 21833677 is a prime.

It is a super-2 number, since 2×21833681² = 953419252019522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21833611) 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, 41486 + ... + 42008.

It is an arithmetic number, because the mean of its divisors is an integer number (2766720).

Almost surely, 2^21833681 is an apocalyptic number.

It is an amenable number.

21833681 is a deficient number, since it is larger than the sum of its proper divisors (300079).

21833681 is a wasteful number, since it uses less digits than its factorization.

21833681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1015.

The product of its digits is 6912, while the sum is 32.

The square root of 21833681 is about 4672.6524587219. The cubic root of 21833681 is about 279.4960365028.

The spelling of 21833681 in words is "twenty-one million, eight hundred thirty-three thousand, six hundred eighty-one".