21411056 has 20 divisors (see below), whose sum is σ = 42105192. Its totient is φ = 10545216.

The previous prime is 21411023. The next prime is 21411059. The reversal of 21411056 is 65011412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21411059) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8915 + ... + 11058.

Almost surely, 2^21411056 is an apocalyptic number.

It is an amenable number.

21411056 is a deficient number, since it is larger than the sum of its proper divisors (20694136).

21411056 is a wasteful number, since it uses less digits than its factorization.

21411056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20048 (or 20042 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 21411056 is about 4627.2082295916. The cubic root of 21411056 is about 277.6809133313.

Adding to 21411056 its reverse (65011412), we get a palindrome (86422468).

The spelling of 21411056 in words is "twenty-one million, four hundred eleven thousand, fifty-six".