21680083 has 8 divisors (see below), whose sum is σ = 24163920. Its totient is φ = 19330560.

The previous prime is 21680077. The next prime is 21680093. The reversal of 21680083 is 38008612.

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 21680083 - 2¹³ = 21671891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21680003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33238 + ... + 33883.

It is an arithmetic number, because the mean of its divisors is an integer number (3020490).

Almost surely, 2^21680083 is an apocalyptic number.

21680083 is a deficient number, since it is larger than the sum of its proper divisors (2483837).

21680083 is a wasteful number, since it uses less digits than its factorization.

21680083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67157.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21680083 is about 4656.1876036088. The cubic root of 21680083 is about 278.8390836484.

Adding to 21680083 its reverse (38008612), we get a palindrome (59688695).

The spelling of 21680083 in words is "twenty-one million, six hundred eighty thousand, eighty-three".