21083316 has 12 divisors (see below), whose sum is σ = 49194432. Its totient is φ = 7027768.

The previous prime is 21083291. The next prime is 21083333. The reversal of 21083316 is 61338012.

It is a tau number, because it is divible by the number of its divisors (12).

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, 878460 + ... + 878483.

It is an arithmetic number, because the mean of its divisors is an integer number (4099536).

Almost surely, 2^21083316 is an apocalyptic number.

It is an amenable number.

21083316 is an abundant number, since it is smaller than the sum of its proper divisors (28111116).

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

21083316 is a wasteful number, since it uses less digits than its factorization.

21083316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756950 (or 1756948 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21083316 is about 4591.6572171712. The cubic root of 21083316 is about 276.2567973321.

The spelling of 21083316 in words is "twenty-one million, eighty-three thousand, three hundred sixteen".