21449084 has 6 divisors (see below), whose sum is σ = 37535904. Its totient is φ = 10724540.

The previous prime is 21449083. The next prime is 21449093. The reversal of 21449084 is 48094412.

It is a self number, because there is not a number n which added to its sum of digits gives 21449084.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21449083) 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 as a sum of consecutive naturals, namely, 2681132 + ... + 2681139.

It is an arithmetic number, because the mean of its divisors is an integer number (6255984).

Almost surely, 2^21449084 is an apocalyptic number.

It is an amenable number.

21449084 is a deficient number, since it is larger than the sum of its proper divisors (16086820).

21449084 is a wasteful number, since it uses less digits than its factorization.

21449084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5362275 (or 5362273 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 21449084 is about 4631.3155798326. The cubic root of 21449084 is about 277.8452116935.

The spelling of 21449084 in words is "twenty-one million, four hundred forty-nine thousand, eighty-four".