21244041 has 24 divisors (see below), whose sum is σ = 37768640. Its totient is φ = 11205216.

The previous prime is 21244001. The next prime is 21244061. The reversal of 21244041 is 14044212.

It is not a de Polignac number, because 21244041 - 2⁶ = 21243977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21244001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12151 + ... + 13788.

Almost surely, 2^21244041 is an apocalyptic number.

21244041 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21244041 is a deficient number, since it is larger than the sum of its proper divisors (16524599).

21244041 is a wasteful number, since it uses less digits than its factorization.

21244041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25965 (or 25962 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 21244041 is about 4609.1258390285. The cubic root of 21244041 is about 276.9570195752.

Adding to 21244041 its reverse (14044212), we get a palindrome (35288253).

It can be divided in two parts, 212 and 44041, that added together give a triangular number (44253 = T₂₉₇).

The spelling of 21244041 in words is "twenty-one million, two hundred forty-four thousand, forty-one".