21442113 has 24 divisors (see below), whose sum is σ = 38615616. Its totient is φ = 11138400.

The previous prime is 21442103. The next prime is 21442133. The reversal of 21442113 is 31124412.

21442113 is nontrivially palindromic in base 13.

It is not a de Polignac number, because 21442113 - 2⁴ = 21442097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21442103) 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 23 ways as a sum of consecutive naturals, for example, 14778 + ... + 16163.

It is an arithmetic number, because the mean of its divisors is an integer number (1608984).

Almost surely, 2^21442113 is an apocalyptic number.

It is an amenable number.

21442113 is a deficient number, since it is larger than the sum of its proper divisors (17173503).

21442113 is a wasteful number, since it uses less digits than its factorization.

21442113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30965 (or 30962 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21442113 is about 4630.5629247425. The cubic root of 21442113 is about 277.8151083281.

Adding to 21442113 its reverse (31124412), we get a palindrome (52566525).

The spelling of 21442113 in words is "twenty-one million, four hundred forty-two thousand, one hundred thirteen".