21361124 has 12 divisors (see below), whose sum is σ = 38177664. Its totient is φ = 10453224.

The previous prime is 21361121. The next prime is 21361133. The reversal of 21361124 is 42116312.

It is a junction number, because it is equal to n+sod(n) for n = 21361096 and 21361105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21361121) by changing a digit.

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, 56624 + ... + 56999.

It is an arithmetic number, because the mean of its divisors is an integer number (3181472).

Almost surely, 2^21361124 is an apocalyptic number.

It is an amenable number.

21361124 is a deficient number, since it is larger than the sum of its proper divisors (16816540).

21361124 is a wasteful number, since it uses less digits than its factorization.

21361124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113674 (or 113672 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 21361124 is about 4621.8096023095. The cubic root of 21361124 is about 277.4648885587.

Adding to 21361124 its reverse (42116312), we get a palindrome (63477436).

The spelling of 21361124 in words is "twenty-one million, three hundred sixty-one thousand, one hundred twenty-four".