21449517 has 8 divisors (see below), whose sum is σ = 28991424. Its totient is φ = 14103648.

The previous prime is 21449503. The next prime is 21449539. The reversal of 21449517 is 71594412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21449517 - 2⁶ = 21449453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21459517) 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 7 ways as a sum of consecutive naturals, for example, 48753 + ... + 49190.

It is an arithmetic number, because the mean of its divisors is an integer number (3623928).

Almost surely, 2^21449517 is an apocalyptic number.

It is an amenable number.

21449517 is a deficient number, since it is larger than the sum of its proper divisors (7541907).

21449517 is an equidigital number, since it uses as much as digits as its factorization.

21449517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98019.

The product of its digits is 10080, while the sum is 33.

The square root of 21449517 is about 4631.3623265730. The cubic root of 21449517 is about 277.8470813330.

The spelling of 21449517 in words is "twenty-one million, four hundred forty-nine thousand, five hundred seventeen".