21944027 has 8 divisors (see below), whose sum is σ = 25207776. Its totient is φ = 18712512.

The previous prime is 21944017. The next prime is 21944029. The reversal of 21944027 is 72044912.

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

It is not a de Polignac number, because 21944027 - 2⁴ = 21944011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21944029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6578 + ... + 9335.

It is an arithmetic number, because the mean of its divisors is an integer number (3150972).

Almost surely, 2^21944027 is an apocalyptic number.

21944027 is a deficient number, since it is larger than the sum of its proper divisors (3263749).

21944027 is a wasteful number, since it uses less digits than its factorization.

21944027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16117.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 21944027 is about 4684.4452179527. The cubic root of 21944027 is about 279.9660970856.

Adding to 21944027 its reverse (72044912), we get a palindrome (93988939).

The spelling of 21944027 in words is "twenty-one million, nine hundred forty-four thousand, twenty-seven".