21944544 has 96 divisors (see below), whose sum is σ = 62052480. Its totient is φ = 6769152.

The previous prime is 21944537. The next prime is 21944551. The reversal of 21944544 is 44544912.

It is an interprime number because it is at equal distance from previous prime (21944537) and next prime (21944551).

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×21944544² = 963126022735872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96559 + ... + 96785.

It is an arithmetic number, because the mean of its divisors is an integer number (646380).

Almost surely, 2^21944544 is an apocalyptic number.

21944544 is a gapful number since it is divisible by the number (24) 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 21944544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31026240).

21944544 is an abundant number, since it is smaller than the sum of its proper divisors (40107936).

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

21944544 is a wasteful number, since it uses less digits than its factorization.

21944544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312 (or 304 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 21944544 is about 4684.5004002561. The cubic root of 21944544 is about 279.9682957300.

The spelling of 21944544 in words is "twenty-one million, nine hundred forty-four thousand, five hundred forty-four".