21080486 has 24 divisors (see below), whose sum is σ = 36972936. Its totient is φ = 8988000.

The previous prime is 21080473. The next prime is 21080497. The reversal of 21080486 is 68408012.

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 24170 + ... + 25026.

It is an arithmetic number, because the mean of its divisors is an integer number (1540539).

Almost surely, 2^21080486 is an apocalyptic number.

21080486 is a deficient number, since it is larger than the sum of its proper divisors (15892450).

21080486 is a wasteful number, since it uses less digits than its factorization.

21080486 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124 (or 1117 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 21080486 is about 4591.3490392258. The cubic root of 21080486 is about 276.2444361880.

Adding to 21080486 its reverse (68408012), we get a palindrome (89488498).

The spelling of 21080486 in words is "twenty-one million, eighty thousand, four hundred eighty-six".