21682801 has 8 divisors (see below), whose sum is σ = 25012800. Its totient is φ = 18410928.

The previous prime is 21682757. The next prime is 21682823. The reversal of 21682801 is 10828612.

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 21682801 - 2⁷ = 21682673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21682801.

It is not an unprimeable number, because it can be changed into a prime (21682861) 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, 13726 + ... + 15223.

It is an arithmetic number, because the mean of its divisors is an integer number (3126600).

Almost surely, 2^21682801 is an apocalyptic number.

It is an amenable number.

21682801 is a deficient number, since it is larger than the sum of its proper divisors (3329999).

21682801 is a wasteful number, since it uses less digits than its factorization.

21682801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29063.

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 21682801 is about 4656.4794641446. The cubic root of 21682801 is about 278.8507357096.

The spelling of 21682801 in words is "twenty-one million, six hundred eighty-two thousand, eight hundred one".