21606076 has 12 divisors (see below), whose sum is σ = 38832808. Its totient is φ = 10510992.

The previous prime is 21606061. The next prime is 21606083. The reversal of 21606076 is 67060612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72846 + ... + 73141.

Almost surely, 2^21606076 is an apocalyptic number.

It is an amenable number.

21606076 is a deficient number, since it is larger than the sum of its proper divisors (17226732).

21606076 is a wasteful number, since it uses less digits than its factorization.

21606076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146028 (or 146026 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21606076 is about 4648.2336430089. The cubic root of 21606076 is about 278.5214408036.

Adding to 21606076 its reverse (67060612), we get a palindrome (88666688).

The spelling of 21606076 in words is "twenty-one million, six hundred six thousand, seventy-six".