21485456 has 20 divisors (see below), whose sum is σ = 42754332. Its totient is φ = 10452096.

The previous prime is 21485437. The next prime is 21485489. The reversal of 21485456 is 65458412.

It can be written as a sum of positive squares in 2 ways, for example, as 8410000 + 13075456 = 2900^2 + 3616^2 .

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 17555 + ... + 18738.

Almost surely, 2^21485456 is an apocalyptic number.

It is an amenable number.

21485456 is a deficient number, since it is larger than the sum of its proper divisors (21268876).

21485456 is a wasteful number, since it uses less digits than its factorization.

21485456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36338 (or 36332 counting only the distinct ones).

The product of its digits is 38400, while the sum is 35.

The square root of 21485456 is about 4635.2406625762. The cubic root of 21485456 is about 278.0021737835.

The spelling of 21485456 in words is "twenty-one million, four hundred eighty-five thousand, four hundred fifty-six".