21330485 has 12 divisors (see below), whose sum is σ = 28135884. Its totient is φ = 15512640.

The previous prime is 21330481. The next prime is 21330487. The reversal of 21330485 is 58403312.

It can be written as a sum of positive squares in 2 ways, for example, as 3020644 + 18309841 = 1738^2 + 4279^2 .

It is not a de Polignac number, because 21330485 - 2² = 21330481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21330481) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 17024 + ... + 18233.

It is an arithmetic number, because the mean of its divisors is an integer number (2344657).

Almost surely, 2^21330485 is an apocalyptic number.

It is an amenable number.

21330485 is a deficient number, since it is larger than the sum of its proper divisors (6805399).

21330485 is a wasteful number, since it uses less digits than its factorization.

21330485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35284 (or 35273 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 21330485 is about 4618.4938020961. The cubic root of 21330485 is about 277.3321659157.

Adding to 21330485 its reverse (58403312), we get a palindrome (79733797).

The spelling of 21330485 in words is "twenty-one million, three hundred thirty thousand, four hundred eighty-five".