21110244 has 48 divisors (see below), whose sum is σ = 51057216. Its totient is φ = 6784000.

The previous prime is 21110233. The next prime is 21110249. The reversal of 21110244 is 44201112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110249) 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 15 ways as a sum of consecutive naturals, for example, 52444 + ... + 52844.

It is an arithmetic number, because the mean of its divisors is an integer number (1063692).

Almost surely, 2^21110244 is an apocalyptic number.

It is an amenable number.

21110244 is an abundant number, since it is smaller than the sum of its proper divisors (29946972).

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

21110244 is a wasteful number, since it uses less digits than its factorization.

21110244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 556 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 21110244 is about 4594.5885561169. The cubic root of 21110244 is about 276.3743607203.

Adding to 21110244 its reverse (44201112), we get a palindrome (65311356).

The spelling of 21110244 in words is "twenty-one million, one hundred ten thousand, two hundred forty-four".