21580485 has 16 divisors (see below), whose sum is σ = 36346560. Its totient is φ = 10903680.

The previous prime is 21580477. The next prime is 21580501. The reversal of 21580485 is 58408512.

It is not a de Polignac number, because 21580485 - 2³ = 21580477 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 15 ways as a sum of consecutive naturals, for example, 37576 + ... + 38145.

It is an arithmetic number, because the mean of its divisors is an integer number (2271660).

Almost surely, 2^21580485 is an apocalyptic number.

It is an amenable number.

21580485 is a deficient number, since it is larger than the sum of its proper divisors (14766075).

21580485 is a wasteful number, since it uses less digits than its factorization.

21580485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75748.

The product of its (nonzero) digits is 12800, while the sum is 33.

The square root of 21580485 is about 4645.4800613069. The cubic root of 21580485 is about 278.4114338142.

Adding to 21580485 its reverse (58408512), we get a palindrome (79988997).

The spelling of 21580485 in words is "twenty-one million, five hundred eighty thousand, four hundred eighty-five".