21673016 has 16 divisors (see below), whose sum is σ = 41502240. Its totient is φ = 10605760.

The previous prime is 21672997. The next prime is 21673021. The reversal of 21673016 is 61037612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28445 + ... + 29196.

It is an arithmetic number, because the mean of its divisors is an integer number (2593890).

Almost surely, 2^21673016 is an apocalyptic number.

It is an amenable number.

21673016 is a deficient number, since it is larger than the sum of its proper divisors (19829224).

21673016 is a wasteful number, since it uses less digits than its factorization.

21673016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57694 (or 57690 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21673016 is about 4655.4286591033. The cubic root of 21673016 is about 278.8087828733.

The spelling of 21673016 in words is "twenty-one million, six hundred seventy-three thousand, sixteen".