21449464 has 8 divisors (see below), whose sum is σ = 40217760. Its totient is φ = 10724728.

The previous prime is 21449453. The next prime is 21449503. The reversal of 21449464 is 46494412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 1340584 + ... + 1340599.

It is an arithmetic number, because the mean of its divisors is an integer number (5027220).

Almost surely, 2^21449464 is an apocalyptic number.

It is an amenable number.

21449464 is a deficient number, since it is larger than the sum of its proper divisors (18768296).

21449464 is a wasteful number, since it uses less digits than its factorization.

21449464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681189 (or 2681185 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 21449464 is about 4631.3566047110. The cubic root of 21449464 is about 277.8468524870.

The spelling of 21449464 in words is "twenty-one million, four hundred forty-nine thousand, four hundred sixty-four".