21953608 has 16 divisors (see below), whose sum is σ = 41258880. Its totient is φ = 10951248.

The previous prime is 21953587. The next prime is 21953621. The reversal of 21953608 is 80635912.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 741 + ... + 6667.

It is an arithmetic number, because the mean of its divisors is an integer number (2578680).

Almost surely, 2^21953608 is an apocalyptic number.

It is an amenable number.

21953608 is a deficient number, since it is larger than the sum of its proper divisors (19305272).

21953608 is a wasteful number, since it uses less digits than its factorization.

21953608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6396 (or 6392 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 21953608 is about 4685.4677461274. The cubic root of 21953608 is about 280.0068365678.

The spelling of 21953608 in words is "twenty-one million, nine hundred fifty-three thousand, six hundred eight".