21485499 has 16 divisors (see below), whose sum is σ = 33296640. Its totient is φ = 12068640.

The previous prime is 21485489. The next prime is 21485507. The reversal of 21485499 is 99458412.

It is not a de Polignac number, because 21485499 - 2⁹ = 21484987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21485499.

It is not an unprimeable number, because it can be changed into a prime (21485489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7432 + ... + 9909.

It is an arithmetic number, because the mean of its divisors is an integer number (2081040).

Almost surely, 2^21485499 is an apocalyptic number.

21485499 is the 2478-th nonagonal number.

21485499 is a deficient number, since it is larger than the sum of its proper divisors (11811141).

21485499 is a wasteful number, since it uses less digits than its factorization.

21485499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17410.

The product of its digits is 103680, while the sum is 42.

The square root of 21485499 is about 4635.2453009523. The cubic root of 21485499 is about 278.0023592436.

The spelling of 21485499 in words is "twenty-one million, four hundred eighty-five thousand, four hundred ninety-nine".