21244153 has 8 divisors (see below), whose sum is σ = 25116480. Its totient is φ = 17581200.

The previous prime is 21244121. The next prime is 21244163. The reversal of 21244153 is 35144212.

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

It is not a de Polignac number, because 21244153 - 2⁵ = 21244121 is a prime.

It is a super-3 number, since 3×21244153³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21244163) 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, 52123 + ... + 52528.

It is an arithmetic number, because the mean of its divisors is an integer number (3139560).

Almost surely, 2^21244153 is an apocalyptic number.

It is an amenable number.

21244153 is a deficient number, since it is larger than the sum of its proper divisors (3872327).

21244153 is a wasteful number, since it uses less digits than its factorization.

21244153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104687.

The product of its digits is 960, while the sum is 22.

The square root of 21244153 is about 4609.1379888218. The cubic root of 21244153 is about 276.9575062863.

Adding to 21244153 its reverse (35144212), we get a palindrome (56388365).

The spelling of 21244153 in words is "twenty-one million, two hundred forty-four thousand, one hundred fifty-three".