21082546 has 16 divisors (see below), whose sum is σ = 32263704. Its totient is φ = 10329984.

The previous prime is 21082543. The next prime is 21082577. The reversal of 21082546 is 64528012.

It can be written as a sum of positive squares in 4 ways, for example, as 19456921 + 1625625 = 4411^2 + 1275^2 .

It is not an unprimeable number, because it can be changed into a prime (21082541) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28396 + ... + 29128.

Almost surely, 2^21082546 is an apocalyptic number.

21082546 is a deficient number, since it is larger than the sum of its proper divisors (11181158).

21082546 is a wasteful number, since it uses less digits than its factorization.

21082546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 21082546 is about 4591.5733686831. The cubic root of 21082546 is about 276.2534341622.

The spelling of 21082546 in words is "twenty-one million, eighty-two thousand, five hundred forty-six".