21608082 has 12 divisors (see below), whose sum is σ = 46817550. Its totient is φ = 7202688.

The previous prime is 21608077. The next prime is 21608089. The reversal of 21608082 is 28080612.

It can be written as a sum of positive squares in only one way, i.e., 20985561 + 622521 = 4581^2 + 789^2 .

It is not an unprimeable number, because it can be changed into a prime (21608089) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 600207 + ... + 600242.

Almost surely, 2^21608082 is an apocalyptic number.

21608082 is an abundant number, since it is smaller than the sum of its proper divisors (25209468).

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

21608082 is a wasteful number, since it uses less digits than its factorization.

21608082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200457 (or 1200454 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 21608082 is about 4648.4494188923. The cubic root of 21608082 is about 278.5300602419.

Adding to 21608082 its reverse (28080612), we get a palindrome (49688694).

The spelling of 21608082 in words is "twenty-one million, six hundred eight thousand, eighty-two".