21442024 has 16 divisors (see below), whose sum is σ = 40364100. Its totient is φ = 10678272.

The previous prime is 21442019. The next prime is 21442037. The reversal of 21442024 is 42024412.

It can be written as a sum of positive squares in 2 ways, for example, as 13089924 + 8352100 = 3618^2 + 2890^2 .

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 21441992 and 21442010.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3159 + ... + 7270.

Almost surely, 2^21442024 is an apocalyptic number.

It is an amenable number.

21442024 is a deficient number, since it is larger than the sum of its proper divisors (18922076).

21442024 is a wasteful number, since it uses less digits than its factorization.

21442024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10692 (or 10688 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 21442024 is about 4630.5533146699. The cubic root of 21442024 is about 277.8147239509.

Adding to 21442024 its reverse (42024412), we get a palindrome (63466436).

The spelling of 21442024 in words is "twenty-one million, four hundred forty-two thousand, twenty-four".