21082558 has 16 divisors (see below), whose sum is σ = 36226944. Its totient is φ = 9014040.

The previous prime is 21082543. The next prime is 21082577. The reversal of 21082558 is 85528012.

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 in 7 ways as a sum of consecutive naturals, for example, 5341 + ... + 8407.

It is an arithmetic number, because the mean of its divisors is an integer number (2264184).

Almost surely, 2^21082558 is an apocalyptic number.

21082558 is a deficient number, since it is larger than the sum of its proper divisors (15144386).

21082558 is a wasteful number, since it uses less digits than its factorization.

21082558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3567.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 21082558 is about 4591.5746754245. The cubic root of 21082558 is about 276.2534865758.

The spelling of 21082558 in words is "twenty-one million, eighty-two thousand, five hundred fifty-eight".