21083086 has 4 divisors (see below), whose sum is σ = 31624632. Its totient is φ = 10541542.

The previous prime is 21083063. The next prime is 21083093. The reversal of 21083086 is 68038012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 5270770 + ... + 5270773.

It is an arithmetic number, because the mean of its divisors is an integer number (7906158).

Almost surely, 2^21083086 is an apocalyptic number.

21083086 is a deficient number, since it is larger than the sum of its proper divisors (10541546).

21083086 is a wasteful number, since it uses less digits than its factorization.

21083086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10541545.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21083086 is about 4591.6321716793. The cubic root of 21083086 is about 276.2557927575.

The spelling of 21083086 in words is "twenty-one million, eighty-three thousand, eighty-six".