21041244 has 36 divisors (see below), whose sum is σ = 60786544. Its totient is φ = 6011712.

The previous prime is 21041243. The next prime is 21041249. The reversal of 21041244 is 44214012.

21041244 is a `hidden beast` number, since 210 + 412 + 44 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41497 + ... + 42000.

Almost surely, 2^21041244 is an apocalyptic number.

It is an amenable number.

21041244 is an abundant number, since it is smaller than the sum of its proper divisors (39745300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21041244 is a wasteful number, since it uses less digits than its factorization.

21041244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83514 (or 83509 counting only the distinct ones).

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

The square root of 21041244 is about 4587.0735769115. The cubic root of 21041244 is about 276.0729170921.

Adding to 21041244 its reverse (44214012), we get a palindrome (65255256).

The spelling of 21041244 in words is "twenty-one million, forty-one thousand, two hundred forty-four".