21082983 has 8 divisors (see below), whose sum is σ = 28135296. Its totient is φ = 14043000.

The previous prime is 21082981. The next prime is 21083017. The reversal of 21082983 is 38928012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21082983 - 2¹ = 21082981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082981) 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 7 ways as a sum of consecutive naturals, for example, 2208 + ... + 6858.

It is an arithmetic number, because the mean of its divisors is an integer number (3516912).

Almost surely, 2^21082983 is an apocalyptic number.

21082983 is a deficient number, since it is larger than the sum of its proper divisors (7052313).

21082983 is a wasteful number, since it uses less digits than its factorization.

21082983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6165.

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 21082983 is about 4591.6209556103. The cubic root of 21082983 is about 276.2553428804.

The spelling of 21082983 in words is "twenty-one million, eighty-two thousand, nine hundred eighty-three".