21484813 has 16 divisors (see below), whose sum is σ = 25159680. Its totient is φ = 17967600.

The previous prime is 21484807. The next prime is 21484817. The reversal of 21484813 is 31848412.

It is not a de Polignac number, because 21484813 - 2¹³ = 21476621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21484817) 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 15 ways as a sum of consecutive naturals, for example, 68928 + ... + 69238.

It is an arithmetic number, because the mean of its divisors is an integer number (1572480).

Almost surely, 2^21484813 is an apocalyptic number.

It is an amenable number.

21484813 is a deficient number, since it is larger than the sum of its proper divisors (3674867).

21484813 is a wasteful number, since it uses less digits than its factorization.

21484813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528.

The product of its digits is 6144, while the sum is 31.

The square root of 21484813 is about 4635.1713021203. The cubic root of 21484813 is about 277.9994004783. Note that the first 3 decimals are identical.

The spelling of 21484813 in words is "twenty-one million, four hundred eighty-four thousand, eight hundred thirteen".