21608083 has 8 divisors (see below), whose sum is σ = 24727040. Its totient is φ = 18497160.

The previous prime is 21608077. The next prime is 21608089. The reversal of 21608083 is 38080612.

It is an interprime number because it is at equal distance from previous prime (21608077) and next prime (21608089).

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 21608083 - 2⁹ = 21607571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21608089) 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, 5788 + ... + 8758.

It is an arithmetic number, because the mean of its divisors is an integer number (3090880).

Almost surely, 2^21608083 is an apocalyptic number.

21608083 is a deficient number, since it is larger than the sum of its proper divisors (3118957).

21608083 is a wasteful number, since it uses less digits than its factorization.

21608083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4017.

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

The square root of 21608083 is about 4648.4495264550. The cubic root of 21608083 is about 278.5300645386.

Adding to 21608083 its reverse (38080612), we get a palindrome (59688695).

The spelling of 21608083 in words is "twenty-one million, six hundred eight thousand, eighty-three".