21244105 has 8 divisors (see below), whose sum is σ = 26182152. Its totient is φ = 16535808.

The previous prime is 21244073. The next prime is 21244121. The reversal of 21244105 is 50144212.

It can be written as a sum of positive squares in 4 ways, for example, as 741321 + 20502784 = 861^2 + 4528^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21244105 - 2⁵ = 21244073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57232 + ... + 57601.

It is an arithmetic number, because the mean of its divisors is an integer number (3272769).

Almost surely, 2^21244105 is an apocalyptic number.

It is an amenable number.

21244105 is a deficient number, since it is larger than the sum of its proper divisors (4938047).

21244105 is a wasteful number, since it uses less digits than its factorization.

21244105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114875.

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 21244105 is about 4609.1327817714. The cubic root of 21244105 is about 276.9572976960.

Adding to 21244105 its reverse (50144212), we get a palindrome (71388317).

The spelling of 21244105 in words is "twenty-one million, two hundred forty-four thousand, one hundred five".