21484881 has 36 divisors (see below), whose sum is σ = 34614580. Its totient is φ = 12830400.

The previous prime is 21484843. The next prime is 21484913. The reversal of 21484881 is 18848412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5803281 + 15681600 = 2409^2 + 3960^2 .

It is not a de Polignac number, because 21484881 - 2⁶ = 21484817 is a prime.

It is a super-2 number, since 2×21484881² = 923200223168322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21484831) 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 35 ways as a sum of consecutive naturals, for example, 118611 + ... + 118791.

Almost surely, 2^21484881 is an apocalyptic number.

It is an amenable number.

21484881 is a deficient number, since it is larger than the sum of its proper divisors (13129699).

21484881 is a wasteful number, since it uses less digits than its factorization.

21484881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 304 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 21484881 is about 4635.1786373343. The cubic root of 21484881 is about 277.9996937698. Note that the first 3 decimals are identical.

The spelling of 21484881 in words is "twenty-one million, four hundred eighty-four thousand, eight hundred eighty-one".