21544127 has 4 divisors (see below), whose sum is σ = 23502696. Its totient is φ = 19585560.

The previous prime is 21544109. The next prime is 21544139. The reversal of 21544127 is 72144512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21544127 - 2⁶ = 21544063 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21544096 and 21544105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21544427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 979268 + ... + 979289.

It is an arithmetic number, because the mean of its divisors is an integer number (5875674).

Almost surely, 2^21544127 is an apocalyptic number.

21544127 is a deficient number, since it is larger than the sum of its proper divisors (1958569).

21544127 is a wasteful number, since it uses less digits than its factorization.

21544127 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1958568.

The product of its digits is 2240, while the sum is 26.

The square root of 21544127 is about 4641.5651455086. The cubic root of 21544127 is about 278.2549935102.

Adding to 21544127 its reverse (72144512), we get a palindrome (93688639).

The spelling of 21544127 in words is "twenty-one million, five hundred forty-four thousand, one hundred twenty-seven".