21541104 has 120 divisors (see below), whose sum is σ = 66891552. Its totient is φ = 6428160.

The previous prime is 21541099. The next prime is 21541127. The reversal of 21541104 is 40114512.

21541104 is a `hidden beast` number, since 21 + 541 + 104 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69109 + ... + 69419.

Almost surely, 2^21541104 is an apocalyptic number.

21541104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21541104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33445776).

21541104 is an abundant number, since it is smaller than the sum of its proper divisors (45350448).

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

21541104 is a wasteful number, since it uses less digits than its factorization.

21541104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 21541104 is about 4641.2394896191. The cubic root of 21541104 is about 278.2419782974.

Adding to 21541104 its reverse (40114512), we get a palindrome (61655616).

The spelling of 21541104 in words is "twenty-one million, five hundred forty-one thousand, one hundred four".