21163056 has 40 divisors (see below), whose sum is σ = 54870000. Its totient is φ = 7028736.

The previous prime is 21163033. The next prime is 21163057. The reversal of 21163056 is 65036112.

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

It is not an unprimeable number, because it can be changed into a prime (21163057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16320 + ... + 17568.

It is an arithmetic number, because the mean of its divisors is an integer number (1371750).

Almost surely, 2^21163056 is an apocalyptic number.

It is an amenable number.

21163056 is an abundant number, since it is smaller than the sum of its proper divisors (33706944).

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

21163056 is a wasteful number, since it uses less digits than its factorization.

21163056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1613 (or 1607 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 21163056 is about 4600.3321619205. The cubic root of 21163056 is about 276.6046395682.

Adding to 21163056 its reverse (65036112), we get a palindrome (86199168).

The spelling of 21163056 in words is "twenty-one million, one hundred sixty-three thousand, fifty-six".