21608076 has 24 divisors (see below), whose sum is σ = 57621760. Its totient is φ = 6173712.

The previous prime is 21608039. The next prime is 21608077. The reversal of 21608076 is 67080612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21608077) 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, 128536 + ... + 128703.

Almost surely, 2^21608076 is an apocalyptic number.

It is an amenable number.

21608076 is an abundant number, since it is smaller than the sum of its proper divisors (36013684).

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

21608076 is a wasteful number, since it uses less digits than its factorization.

21608076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257253 (or 257251 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 21608076 is about 4648.4487735157. The cubic root of 21608076 is about 278.5300344618.

Adding to 21608076 its reverse (67080612), we get a palindrome (88688688).

The spelling of 21608076 in words is "twenty-one million, six hundred eight thousand, seventy-six".