21967308 has 108 divisors (see below), whose sum is σ = 64164520. Its totient is φ = 6494400.

The previous prime is 21967303. The next prime is 21967331. The reversal of 21967308 is 80376912.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a tau number, because it is divible by the number of its divisors (108).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21967303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 535768 + ... + 535808.

Almost surely, 2^21967308 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21967308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32082260).

21967308 is an abundant number, since it is smaller than the sum of its proper divisors (42197212).

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

21967308 is a wasteful number, since it uses less digits than its factorization.

21967308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117 (or 57 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 21967308 is about 4686.9294852814. The cubic root of 21967308 is about 280.0650699111.

The spelling of 21967308 in words is "twenty-one million, nine hundred sixty-seven thousand, three hundred eight".