21944465 has 8 divisors (see below), whose sum is σ = 26535168. Its totient is φ = 17421040.

The previous prime is 21944437. The next prime is 21944473. The reversal of 21944465 is 56444912.

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

It is not a de Polignac number, because 21944465 - 2¹⁶ = 21878929 is a prime.

It is a Duffinian number.

It is a Curzon 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, 16097 + ... + 17406.

It is an arithmetic number, because the mean of its divisors is an integer number (3316896).

Almost surely, 2^21944465 is an apocalyptic number.

It is an amenable number.

21944465 is a deficient number, since it is larger than the sum of its proper divisors (4590703).

21944465 is a wasteful number, since it uses less digits than its factorization.

21944465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33639.

The product of its digits is 34560, while the sum is 35.

The square root of 21944465 is about 4684.4919681861. The cubic root of 21944465 is about 279.9679597692.

The spelling of 21944465 in words is "twenty-one million, nine hundred forty-four thousand, four hundred sixty-five".