21443113 has 4 divisors (see below), whose sum is σ = 21597520. Its totient is φ = 21288708.

The previous prime is 21443099. The next prime is 21443119. The reversal of 21443113 is 31134412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21443113 - 2¹³ = 21434921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21443119) 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, 76995 + ... + 77272.

It is an arithmetic number, because the mean of its divisors is an integer number (5399380).

Almost surely, 2^21443113 is an apocalyptic number.

It is an amenable number.

21443113 is a deficient number, since it is larger than the sum of its proper divisors (154407).

21443113 is a wasteful number, since it uses less digits than its factorization.

21443113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154406.

The product of its digits is 288, while the sum is 19.

The square root of 21443113 is about 4630.6709017161. The cubic root of 21443113 is about 277.8194271001.

Adding to 21443113 its reverse (31134412), we get a palindrome (52577525).

The spelling of 21443113 in words is "twenty-one million, four hundred forty-three thousand, one hundred thirteen".