21244849 has 8 divisors (see below), whose sum is σ = 23270760. Its totient is φ = 19305216.

The previous prime is 21244819. The next prime is 21244859. The reversal of 21244849 is 94844212.

It can be written as a sum of positive squares in 4 ways, for example, as 4080400 + 17164449 = 2020^2 + 4143^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21244849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21244819) by changing a digit.

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, 21054 + ... + 22039.

It is an arithmetic number, because the mean of its divisors is an integer number (2908845).

Almost surely, 2^21244849 is an apocalyptic number.

21244849 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21244849 is a deficient number, since it is larger than the sum of its proper divisors (2025911).

21244849 is a wasteful number, since it uses less digits than its factorization.

21244849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43139.

The product of its digits is 18432, while the sum is 34.

The square root of 21244849 is about 4609.2134903907. The cubic root of 21244849 is about 276.9605308098.

The spelling of 21244849 in words is "twenty-one million, two hundred forty-four thousand, eight hundred forty-nine".