21034244 has 48 divisors (see below), whose sum is σ = 47394816. Its totient is φ = 7927200.

The previous prime is 21034231. The next prime is 21034249. The reversal of 21034244 is 44243012.

It is not an unprimeable number, because it can be changed into a prime (21034249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8447 + ... + 10649.

It is an arithmetic number, because the mean of its divisors is an integer number (987392).

Almost surely, 2^21034244 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21034244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23697408).

21034244 is an abundant number, since it is smaller than the sum of its proper divisors (26360572).

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

21034244 is a wasteful number, since it uses less digits than its factorization.

21034244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2256 (or 2254 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 21034244 is about 4586.3104997372. The cubic root of 21034244 is about 276.0422990551.

Adding to 21034244 its reverse (44243012), we get a palindrome (65277256).

The spelling of 21034244 in words is "twenty-one million, thirty-four thousand, two hundred forty-four".