21541056 has 56 divisors (see below), whose sum is σ = 57448704. Its totient is φ = 7123200.

The previous prime is 21541049. The next prime is 21541061. The reversal of 21541056 is 65014512.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28621 + ... + 29363.

Almost surely, 2^21541056 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 21541056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28724352).

21541056 is an abundant number, since it is smaller than the sum of its proper divisors (35907648).

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

21541056 is a wasteful number, since it uses less digits than its factorization.

21541056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 909 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 21541056 is about 4641.2343185838. The cubic root of 21541056 is about 278.2417716286.

Adding to 21541056 its reverse (65014512), we get a palindrome (86555568).

The spelling of 21541056 in words is "twenty-one million, five hundred forty-one thousand, fifty-six".