21112244 has 12 divisors (see below), whose sum is σ = 37328004. Its totient is φ = 10447104.

The previous prime is 21112241. The next prime is 21112279. The reversal of 21112244 is 44221112.

It can be written as a sum of positive squares in 2 ways, for example, as 10627600 + 10484644 = 3260^2 + 3238^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26819 + ... + 27594.

It is an arithmetic number, because the mean of its divisors is an integer number (3110667).

Almost surely, 2^21112244 is an apocalyptic number.

It is an amenable number.

21112244 is a deficient number, since it is larger than the sum of its proper divisors (16215760).

21112244 is a wasteful number, since it uses less digits than its factorization.

21112244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54514 (or 54512 counting only the distinct ones).

The product of its digits is 128, while the sum is 17.

The square root of 21112244 is about 4594.8061983070. The cubic root of 21112244 is about 276.3830884146.

Adding to 21112244 its reverse (44221112), we get a palindrome (65333356).

The spelling of 21112244 in words is "twenty-one million, one hundred twelve thousand, two hundred forty-four".