21041104 has 80 divisors (see below), whose sum is σ = 50675328. Its totient is φ = 8257536.

The previous prime is 21041099. The next prime is 21041107. The reversal of 21041104 is 40114012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21041107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81744 + ... + 82000.

Almost surely, 2^21041104 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 21041104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25337664).

21041104 is an abundant number, since it is smaller than the sum of its proper divisors (29634224).

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

21041104 is a wasteful number, since it uses less digits than its factorization.

21041104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332 (or 326 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 21041104 is about 4587.0583166121. The cubic root of 21041104 is about 276.0723047979.

Adding to 21041104 its reverse (40114012), we get a palindrome (61155116).

It can be divided in two parts, 210 and 41104, that added together give a palindrome (41314).

The spelling of 21041104 in words is "twenty-one million, forty-one thousand, one hundred four".