21110144 has 96 divisors (see below), whose sum is σ = 48837600. Its totient is φ = 9067520.

The previous prime is 21110129. The next prime is 21110149. The reversal of 21110144 is 44101112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 449129 + ... + 449175.

It is an arithmetic number, because the mean of its divisors is an integer number (508725).

Almost surely, 2^21110144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21110144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24418800).

21110144 is an abundant number, since it is smaller than the sum of its proper divisors (27727456).

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

21110144 is a wasteful number, since it uses less digits than its factorization.

21110144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 21110144 is about 4594.5776737367. The cubic root of 21110144 is about 276.3739243211.

Adding to 21110144 its reverse (44101112), we get a palindrome (65211256).

The spelling of 21110144 in words is "twenty-one million, one hundred ten thousand, one hundred forty-four".