21361112 has 32 divisors (see below), whose sum is σ = 44258400. Its totient is φ = 9613824.

The previous prime is 21361097. The next prime is 21361121. The reversal of 21361112 is 21116312.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 287 + ... + 6542.

It is an arithmetic number, because the mean of its divisors is an integer number (1383075).

Almost surely, 2^21361112 is an apocalyptic number.

It is an amenable number.

21361112 is an abundant number, since it is smaller than the sum of its proper divisors (22897288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21361112 is a wasteful number, since it uses less digits than its factorization.

21361112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6875 (or 6871 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 21361112 is about 4621.8083041165. The cubic root of 21361112 is about 277.4648366017.

Adding to 21361112 its reverse (21116312), we get a palindrome (42477424).

The spelling of 21361112 in words is "twenty-one million, three hundred sixty-one thousand, one hundred twelve".