21542441 has 8 divisors (see below), whose sum is σ = 22190784. Its totient is φ = 20900880.

The previous prime is 21542413. The next prime is 21542453. The reversal of 21542441 is 14424512.

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 21542441 - 2⁶ = 21542377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21542341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5156 + ... + 8346.

It is an arithmetic number, because the mean of its divisors is an integer number (2773848).

Almost surely, 2^21542441 is an apocalyptic number.

It is an amenable number.

21542441 is a deficient number, since it is larger than the sum of its proper divisors (648343).

21542441 is a wasteful number, since it uses less digits than its factorization.

21542441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391.

The product of its digits is 1280, while the sum is 23.

The square root of 21542441 is about 4641.3835221839. The cubic root of 21542441 is about 278.2477347624.

Adding to 21542441 its reverse (14424512), we get a palindrome (35966953).

The spelling of 21542441 in words is "twenty-one million, five hundred forty-two thousand, four hundred forty-one".