21067308 has 36 divisors (see below), whose sum is σ = 53414088. Its totient is φ = 7001280.

The previous prime is 21067303. The next prime is 21067331. The reversal of 21067308 is 80376012.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (21067303) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 15288 + ... + 16608.

Almost surely, 2^21067308 is an apocalyptic number.

It is an amenable number.

21067308 is an abundant number, since it is smaller than the sum of its proper divisors (32346780).

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

21067308 is a wasteful number, since it uses less digits than its factorization.

21067308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1774 (or 1769 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 21067308 is about 4589.9137246794. The cubic root of 21067308 is about 276.1868614875.

The spelling of 21067308 in words is "twenty-one million, sixty-seven thousand, three hundred eight".