21844047 has 8 divisors (see below), whose sum is σ = 30129840. Its totient is φ = 14060480.

The previous prime is 21844033. The next prime is 21844051. The reversal of 21844047 is 74044812.

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

It is a cyclic number.

It is not a de Polignac number, because 21844047 - 2⁷ = 21843919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21844007) 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, 125454 + ... + 125627.

It is an arithmetic number, because the mean of its divisors is an integer number (3766230).

Almost surely, 2^21844047 is an apocalyptic number.

21844047 is a deficient number, since it is larger than the sum of its proper divisors (8285793).

21844047 is a wasteful number, since it uses less digits than its factorization.

21844047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251113.

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 21844047 is about 4673.7615471909. The cubic root of 21844047 is about 279.5402617150.

Adding to 21844047 its reverse (74044812), we get a palindrome (95888859).

The spelling of 21844047 in words is "twenty-one million, eight hundred forty-four thousand, forty-seven".