21844056 has 64 divisors (see below), whose sum is σ = 59965920. Its totient is φ = 6589440.

The previous prime is 21844051. The next prime is 21844061. The reversal of 21844056 is 65044812.

It is an interprime number because it is at equal distance from previous prime (21844051) and next prime (21844061).

It is a super-2 number, since 2×21844056² = 954325565062272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21844051) 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, 15876 + ... + 17196.

Almost surely, 2^21844056 is an apocalyptic number.

21844056 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21844056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29982960).

21844056 is an abundant number, since it is smaller than the sum of its proper divisors (38121864).

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

21844056 is a wasteful number, since it uses less digits than its factorization.

21844056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396 (or 1392 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 21844056 is about 4673.7625100127. The cubic root of 21844056 is about 279.5403001063.

Adding to 21844056 its reverse (65044812), we get a palindrome (86888868).

The spelling of 21844056 in words is "twenty-one million, eight hundred forty-four thousand, fifty-six".