21248844 has 24 divisors (see below), whose sum is σ = 52497648. Its totient is φ = 6666240.

The previous prime is 21248831. The next prime is 21248879. The reversal of 21248844 is 44884212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51877 + ... + 52284.

It is an arithmetic number, because the mean of its divisors is an integer number (2187402).

Almost surely, 2^21248844 is an apocalyptic number.

It is an amenable number.

21248844 is an abundant number, since it is smaller than the sum of its proper divisors (31248804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21248844 is a wasteful number, since it uses less digits than its factorization.

21248844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104185 (or 104183 counting only the distinct ones).

The product of its digits is 16384, while the sum is 33.

The square root of 21248844 is about 4609.6468411365. The cubic root of 21248844 is about 276.9778901232.

It can be divided in two parts, 21 and 248844, that added together give a triangular number (248865 = T₇₀₅).

The spelling of 21248844 in words is "twenty-one million, two hundred forty-eight thousand, eight hundred forty-four".