21944045 has 8 divisors (see below), whose sum is σ = 26369280. Its totient is φ = 17530960.

The previous prime is 21944029. The next prime is 21944057. The reversal of 21944045 is 54044912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21944045 - 2⁴ = 21944029 is a prime.

It is a super-2 number, since 2×21944045² = 963082221924050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21943999 and 21944017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1580 + ... + 6810.

It is an arithmetic number, because the mean of its divisors is an integer number (3296160).

Almost surely, 2^21944045 is an apocalyptic number.

It is an amenable number.

21944045 is a deficient number, since it is larger than the sum of its proper divisors (4425235).

21944045 is an equidigital number, since it uses as much as digits as its factorization.

21944045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6075.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21944045 is about 4684.4471392044. The cubic root of 21944045 is about 279.9661736347.

Adding to 21944045 its reverse (54044912), we get a palindrome (75988957).

The spelling of 21944045 in words is "twenty-one million, nine hundred forty-four thousand, forty-five".