21241111 has 4 divisors (see below), whose sum is σ = 21497112. Its totient is φ = 20985112.

The previous prime is 21241093. The next prime is 21241123. The reversal of 21241111 is 11114212.

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 21241111 - 2¹³ = 21232919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21241091 and 21241100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241511) 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 3 ways as a sum of consecutive naturals, for example, 127876 + ... + 128041.

It is an arithmetic number, because the mean of its divisors is an integer number (5374278).

Almost surely, 2^21241111 is an apocalyptic number.

21241111 is a deficient number, since it is larger than the sum of its proper divisors (256001).

21241111 is an equidigital number, since it uses as much as digits as its factorization.

21241111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256000.

The product of its digits is 16, while the sum is 13.

The square root of 21241111 is about 4608.8079803784. The cubic root of 21241111 is about 276.9442862574.

Adding to 21241111 its reverse (11114212), we get a palindrome (32355323).

The spelling of 21241111 in words is "twenty-one million, two hundred forty-one thousand, one hundred eleven".