21244449 has 8 divisors (see below), whose sum is σ = 28347232. Its totient is φ = 14152320.

The previous prime is 21244417. The next prime is 21244459. The reversal of 21244449 is 94444212.

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

It is not a de Polignac number, because 21244449 - 2⁵ = 21244417 is a prime.

It is a super-2 number, since 2×21244449² = 902653226627202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21244459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6414 + ... + 9144.

It is an arithmetic number, because the mean of its divisors is an integer number (3543404).

Almost surely, 2^21244449 is an apocalyptic number.

It is an amenable number.

21244449 is a deficient number, since it is larger than the sum of its proper divisors (7102783).

21244449 is a wasteful number, since it uses less digits than its factorization.

21244449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5327.

The product of its digits is 9216, while the sum is 30.

The square root of 21244449 is about 4609.1700988356. The cubic root of 21244449 is about 276.9587925860.

The spelling of 21244449 in words is "twenty-one million, two hundred forty-four thousand, four hundred forty-nine".