21020676 has 24 divisors (see below), whose sum is σ = 49556640. Its totient is φ = 6934272.

The previous prime is 21020651. The next prime is 21020683. The reversal of 21020676 is 67602012.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7866 + ... + 10193.

It is an arithmetic number, because the mean of its divisors is an integer number (2064860).

Almost surely, 2^21020676 is an apocalyptic number.

It is an amenable number.

21020676 is an abundant number, since it is smaller than the sum of its proper divisors (28535964).

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

21020676 is a wasteful number, since it uses less digits than its factorization.

21020676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18163 (or 18161 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 21020676 is about 4584.8310764956. The cubic root of 21020676 is about 275.9829332022.

Adding to 21020676 its reverse (67602012), we get a palindrome (88622688).

The spelling of 21020676 in words is "twenty-one million, twenty thousand, six hundred seventy-six".