21271608 has 24 divisors (see below), whose sum is σ = 57610800. Its totient is φ = 7090512.

The previous prime is 21271567. The next prime is 21271637. The reversal of 21271608 is 80617212.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 147648 + ... + 147791.

It is an arithmetic number, because the mean of its divisors is an integer number (2400450).

Almost surely, 2^21271608 is an apocalyptic number.

It is an amenable number.

21271608 is an abundant number, since it is smaller than the sum of its proper divisors (36339192).

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

21271608 is a wasteful number, since it uses less digits than its factorization.

21271608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295451 (or 295444 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 21271608 is about 4612.1153498151. The cubic root of 21271608 is about 277.0767641209.

The spelling of 21271608 in words is "twenty-one million, two hundred seventy-one thousand, six hundred eight".