21080485 has 8 divisors (see below), whose sum is σ = 25774200. Its totient is φ = 16545984.

The previous prime is 21080473. The next prime is 21080497. The reversal of 21080485 is 58408012.

It is an interprime number because it is at equal distance from previous prime (21080473) and next prime (21080497).

It can be written as a sum of positive squares in 4 ways, for example, as 11082241 + 9998244 = 3329^2 + 3162^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21080485 - 2²¹ = 18983333 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 39510 + ... + 40039.

It is an arithmetic number, because the mean of its divisors is an integer number (3221775).

Almost surely, 2^21080485 is an apocalyptic number.

It is an amenable number.

21080485 is a deficient number, since it is larger than the sum of its proper divisors (4693715).

21080485 is an equidigital number, since it uses as much as digits as its factorization.

21080485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79607.

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 21080485 is about 4591.3489303254. The cubic root of 21080485 is about 276.2444318200.

Adding to 21080485 its reverse (58408012), we get a palindrome (79488497).

The spelling of 21080485 in words is "twenty-one million, eighty thousand, four hundred eighty-five".