21022016 has 28 divisors (see below), whose sum is σ = 41928288. Its totient is φ = 10457472.

The previous prime is 21022009. The next prime is 21022021. The reversal of 21022016 is 61022012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13805 + ... + 15251.

Almost surely, 2^21022016 is an apocalyptic number.

It is an amenable number.

21022016 is a deficient number, since it is larger than the sum of its proper divisors (20906272).

21022016 is a wasteful number, since it uses less digits than its factorization.

21022016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21022016 is about 4584.9772082312. The cubic root of 21022016 is about 275.9887974169.

Adding to 21022016 its reverse (61022012), we get a palindrome (82044028).

The spelling of 21022016 in words is "twenty-one million, twenty-two thousand, sixteen".